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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BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen Bacteria Virus Allergen, Odor Removal, for Home Office Kitchen, Washable Pre Filter, HEPASilent, Medium Room, Blue 311 Auto

Product ID: 222499130

Details

Brand
BLUEAIR
Color
Taupe (No
Item Weight
5 kg
Power Source
Corded
Product Dimensions
10.2"D x x

⚡3W ultra-low energy use

🔇23 dB whisper-quiet operation

🌬️388 sqft cleaned in 12.5 min

Description

🌿 Breathe smarter, live fresher — the air purifier your home deserves!

SMART AUTO MODE - One-touch sensor-driven fan adjusts to real-time air quality for effortless breathing.
ALLERGEN ODOR FIGHTER - Removes 99.99% of pollen, pet dander, smoke, and odors down to 0.1 micron particles.
HEPA SILENT™ DUAL FILTRATION - Combines mechanical + electrostatic tech for 45% faster cleaning with 67% less noise.
ULTRA QUIET ENERGY EFFICIENT - Runs quieter than a whisper at 23 dB while consuming less power than an LED bulb.
AWARD WINNING SCANDINAVIAN DESIGN - Sleek, compact, and customizable pre-filters that elevate your space’s aesthetic.

The BLUEAIR 311 Auto is a medium-room air purifier featuring HEPASilent™ dual filtration technology that cleans 388 sqft in just 12.5 minutes. It operates ultra-quietly at 23 dB and uses only 3 watts of power, making it Energy Star certified. With smart auto mode, it continuously monitors and adjusts fan speed based on air quality, removing 99.99% of allergens, smoke, pet dander, and odors down to 0.1 microns. Its award-winning Scandinavian design includes washable, customizable pre-filters, making it a top choice for allergy sufferers and style-conscious professionals alike.

Specifications

ASIN	B08F13L1CH
ASIN	B08F13L1CH
Best Sellers Rank	#7,318 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #26 in HEPA Filter Air Purifiers
Brand Name	BLUEAIR
Color	Taupe (No Wifi)
Contaminant Filtration Capability	True
Control Method	Touch
Controller Type	Button Control
Customer Reviews	4.6 4.6 out of 5 stars (3,140)
Date First Available	August 25, 2020
Filter Class	HEPA + Carbon
Filter Type	Pre-Filter
Floor Area	388 square_feet
Global Trade Identification Number	00689122013695
Included Components	Blue Pure 311 Auto Purifier, Washable Pre-filter in Arctic Trail
Item Dimensions D x W x H	10.2"D x 10.2"W x 20.5"H
Item Type Name	Air Purifier
Item Weight	5 kg
Item model number	3431101000
Manufacturer	Blueair
Manufacturer	Blueair
Model Number	3431101000
Noise Level	23 db
Number of Packs	1
Part Number	311PACF105529
Particle Retention Size	0.1 micron
Power Source	Corded Electric
Product Dimensions	4.02 x 8.07 x 4.02 inches; 11.02 pounds
Special Features	Manual
Specification Met	Energy Star Certified
UPC	689122013695 689122019635
Unit Count	1 Count
Wattage	3 watts

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