How long does a filter last? I bought mine 3 weeks ago and the red light already came on signaling it needs to be replaced.

Which red light? The red light for filter replacement is on top and shouldn't come for 6 months or more depending on how long and high the fan setting. Page 11 of manual. The red led on front side is red if polluted air is detected, then yellow then blue when air is clear. Page 10.

How much do the filters cost and where do I get them

As of 7/13/2022, Amazon sells replacement filters. Original is $21.

Do you have to use auto mode? To reduce noise we may want to use low setting at certain times, is that do-able?

You do not have to use these machines in Auto Mode. You can set to a manual speed if you would prefer to have controls over the fan speeds.

Consumer reports rates the 411 Auto very poorly for filtration at any speed. Does the manufacturer have a response to this?

I subscribe to consumer reports, but I am not always a fan of their review methodology. I think the problem here is that they compare all sizes of purifiers together, when the smaller units should be compared with other smaller units. Of course, a larger unit with higher CFM air flow and larger filter area will perform better than a smaller unit. Other review sites gave this purifier good ratings for its size. Some recommend just buying the larger unit, which is rated highly by Consumer Reports and running on a lower speed setting.

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🌬️ Breathe smarter, live cleaner—quiet power that keeps you ahead of the air quality curve.

SMART AUTO MODE - One-touch particle sensor adjusts fan speed for optimal air quality—effortless freshness.
ALLERGEN VIRUS DEFENSE - Removes 99.99% of pollen, bacteria, viruses & particles down to 0.1 micron for healthier breathing.
SLEEK SCANDINAVIAN DESIGN - Award-winning minimalist style fits any modern workspace or home without cramping your vibe.
HEPA SILENT DUAL FILTRATION - Combines mechanical + electrostatic tech for 45% faster cleaning with 67% less noise.
ULTRA QUIET ENERGY EFFICIENT - Whisper-quiet 18 dB operation uses less power than an LED bulb—eco-friendly & wallet-wise.

The Blueair 3210 air purifier uses patented HEPASilent technology to clean 190 sq.ft rooms in just 12.5 minutes, operating at whisper-quiet 18 dB and ultra-low 2W power. It removes 99.99% of airborne particles including viruses, bacteria, pollen, and odors down to 0.1 micron. Certified energy-efficient and independently tested for safety, it features an auto-adjusting fan with real-time air quality LED indicators, making it the perfect blend of performance, style, and convenience for allergy sufferers and health-conscious professionals.

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Brand	BLUEAIR
Floor Area	190 Square Feet
Specification Met	energy star
Noise Level	48 dB
Particle Retention Size	0.1 Micron
Controller Type	Button Control
Wattage	2 Watts
UPC	689122018928 689122019628 689122013688
Item model number	3231101000
ASIN	B08FCX8Z52

Blueair air purifier 3210 Cleans 183 sq. ft.Filter change Indicator Unique HEPA Silent technology combines 2 filteration technology kills bacteria and virus Activated Carbon absorbs chemicals - White

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