I agree with everything Patrica had to say in the previous review. There are two speeds: high or low, and two modes: always on or automatic. In the automatic mode is senses the air quality and turns on as needed. In the manual mode, it's the same speed all the time. It does seem to be completely random and I don't have a lot of faith in the algorithm - but who knows - these are supposed to be very small particles anyway. The low mode is ultra quiet, as promised, but the high mode is ultra noisy, so loud that it wakes me when sleeping. So, I use low mode. I've had it for around a year or so, and, the filters are not dirty at all. This makes me wonder if it's doing anything useful. If it were cleaning the air, I'd expect to see buildup of materials in the filters. It's probably doing no harm, and doing some good, just not sure how much good ...

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

[UPDATE: I've now had this air filter for one year. It's still in good condition, and I've figured out how to use it. Basically, if you are a sensitive allergy sufferer like me, you need to keep it on its very highest setting while you are in the room (I was leaving it on "auto" when I wrote this review.) Luckily even the loudest setting is not much different from my friend's Honeywell filter on "quiet." When the setting is left on high, I can smell that the air inside my tiny room is noticeably cleaner and fresher, and my allergies are noticeably better. I wish I could upgrade the star level to "4". My original review follows:]

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 98 square feet/1000 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.

I'm not sure this filter is really doing anything; it certainly hasn't helped my allergies. I have it in my bedroom, which is a closet-sized room very high ceilings, about 120 square feet/1500 cubic feet in size. The filter itself is very narrow and tall, about the size of two flat screen computer monitors, so it fits really well against a wall despite the very limited space.

One thing that makes me less confident in this purifier is that its air quality detector's readings seem completely random. For example, it'll switch from the green "Everything looks great" indicator to a bright red "High particle concentration" alert within seconds, without going through any of the intermediate levels. So you're lying there asleep with the fan going at a gentle whisper, and vroom, it's like someone plugged in the vacuum cleaner all of a sudden. I don't understand how the air quality in my room can get that bad in a matter of seconds when nothing visible has changed.