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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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: 305638950

Details

Brand
BLUEAIR
Colour
White
Item weight
5 Kilograms
Power source
Corded
Product dimensions
25.9D x 52.1W

⚡45% faster cleaning

🌿99.99% allergen removal

🔇23 dB whisper-quiet

$1671.51

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Description

🌬️ Breathe smarter, live cleaner — the air purifier your lifestyle deserves.

ODOR PARTICLE DEFENSE - Traps smoke, pet dander, pollen, and odors down to 0.1 micron with 99.97% efficiency.
WHISPER QUIET OPERATION - At 23 dB, it’s quieter than a whisper—perfect for work or sleep.
AUTO ADJUSTING AIR QUALITY - One-touch sensor-driven mode keeps your space fresh effortlessly.
HEPA SILENT DUAL FILTRATION - Combines mechanical + electrostatic tech for ultra-fast, ultra-quiet purification.
AWARD WINNING SWEDISH DESIGN - Sleek, customizable pre-filters that elevate your room’s style while purifying.

The Blue Pure 311 Auto air purifier delivers rapid, whisper-quiet air cleaning for medium to extra-large rooms using patented HEPASilent technology. It auto-adjusts fan speed based on real-time air quality, removes 99.99% of allergens and particles as small as 0.1 micron, and traps household odors with a carbon filter. Energy Star certified and independently tested, it combines award-winning Swedish design with high performance to keep your home, office, or kitchen fresh and healthy.

Specifications

ASIN	B08F13L1CH
Best Sellers Rank	#22,818 in Kitchen ( See Top 100 in Kitchen ) #1,328 in Heating & Cooling
Brand Name	BLUEAIR
Color	White
Contaminant Filtration Capability	Yes
Control Method	Push Button
Controller Type	Button Control
Customer Reviews	4.6 4.6 out of 5 stars (2,994)
Filter Class	HEPASilent
Filter Type	HEPA
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	25.9D x 52.1W x 25.9H centimeters
Item Type Name	Air Purifier
Item Weight	5 Kilograms
Manufacturer	Blueair
Model Number	3431101000
Noise Level	23 Decibels
Part Number	311PACF105529
Particle Retention Size	0.1 Micron
Power Source	Corded Electric
Smart Home Compatibility	Not Smart Home Compatible
Special Features	Manual
Specification Met	Energy Star Certified
UPC	689122013695 689122019635
Unit Count	1 Count
Wattage	3 watts

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$1671.51

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

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