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What are the best air purifiers for large rooms?

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Airmega 400S vs IQAir HealthPro Plus

Specs

Weight

24.7 lbs

Power consumption

66 W

Timer

Yes

Coverage

1560 sq-ft.

CADR (Dust, Pollen, Smoke)

350/350/350

Weight

35 lbs. (16 kg)

Power consumption

27, 53, 92, 121, 154, 215 Watt; Standby: <1 Watt

Timer

yes (allows programming of operating hours and weekdays)

Coverage

563 sq. ft. (assuming 4 room changes per hour)

CADR (Dust, Pollen, Smoke)

230 (Estimated, not provided officialy)

Pros + Cons

Pro
 Two colors to choose from

The air purifier is available in two colors: white and graphite. This gives you some choice regarding what suits the decoration of the room better.
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Pro
 Excellent for large rooms or office spaces

The Airmega 400S's fans are notably powerful. They're capable of easily pushing the air of a 700 square feet room up to four times in an hour. Its CADR rating is 350, an impressive result considering that most purifiers score 200-250, which is quantifiable proof of its effectiveness in cleaning large spaces and guaranteeing good air quality, even if the air is very contaminated.
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Pro
 Takes in air from both sides

This purifier intakes air from the right and left side, so you don’t have to worry about placing it with the back against the wall, as long as there are 12" of free space on each side.
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Pro
 Lets you know when the filter needs changing

The filter's lifespan indicator will tell you when it’s time to change the filters. You're notified via an LED light or through an app warning.
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Pro
 Allows monitoring air quality

Airmega’s sensors monitor the room's air quality in real time and it colored LED ring lets you know how clean the air is. Alternatively, you can use a smartphone application to do the same and even check air quality history.
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Pro
 Sensor-based modes that adjust automatically

The 400S changes has 3 modes that adjust automatically depending on its sensor's readings. The Auto mode automatically adjusts the air filtration speed based on the air quality readings, while the Eco mode turns off the purifier when the air quality remains good for 10 minutes and turns it back on if it senses contamination. The Sleep mode detects ambient light levels and, once it gets dark, it will run the purifier at the lowest speeds possible, to keep the noise level as low as possible.
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Pro
 Can be controlled remotely

The Airmega 400s can be controlled via a smartphone app or through Amazon's Alexa. This eliminates the need to go to the device when you want to change some settings and also provides a very detailed status overview, including schedules and air quality.
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Pro
 Looks very modern

The purifier is made from high-quality materials and its design feels very modern. The pulsating front air quality light is a nice touch that gives the device a futuristic look.
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Pro
 Operates quietly

This is a very quiet purifier. Even when running on maximum speed, it only emits a 55dB noise, which is as high as a quiet conversation.
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Con
 Can’t be shipped to California

Because of legal reasons, this air purifier can’t be brought to California.
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Con
 Touch controls are easy to accidentally press

The touch controls are too sensitive, and you can press them by accident.
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Pro
 Exceptional filtering action

The HEPA filter used in this purifier is one of the best available. It can trap 99.5% particles as small as 0.003 microns, while other purifiers can only do that with 0.3 micron-sized particles.
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Pro
 Hand-made wood casing available

You can order it with a hand-made wood casing, which can be convenient if you have antique furniture you want it to match with. This extra will bump the price to $2500.
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Pro
 Has a timer schedule

You can schedule the unit to run only on specified days and certain hours. With this option, you can eliminate useless running and save both energy and filter life. It's also useful for light sleepers, as the unit can be set to turn on automatically on low speed in the middle of the night when your sleep is at its deepest.
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Pro
 Status information is easy to read

Instead of the numerous LCD status lights found in other purifiers, this unit has an LCD screen that shows real-time data regarding the operation of the purifier. The screen gives you info about the current airflow, power level, and filter status, among other useful stuff. This screen is easier to understand and more precise than indicator lights.
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Con
 Expensive maintenance

The filters are expensive, so it is critical to change them only when needed and take proper care of the pre-filter. The HEPA filter costs a whopping $200 and the carbon filter costs around 100$.
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Con
 Very loud at high speeds

It can get very loud when running at its highest speed, being capable of reaching 70dB noise level.
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Con
 Can't handle intense smoking well

The IQAir Healthpro system can’t withstand heavy tobacco smoke. The filter’s carbon granules will quickly become overly saturated, losing their effectiveness.
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