Went to check the manual for a question and just realized out Blue air did not come with a pre-filter. Wasn't it supposed to?

Hi there, your Blue Pure 211+ Auto comes with one pre-filter in Arctic Trail, which may have come pre-installed on the unit (the grey external fabric). If this is not the case, please e-mail info@blueair.com and we will be happy to send a replacement.

From which PM2.5 reading does the air purifier start increasing fan speed?

I have not seen it automatically increase fan speed. I set it on the 1,2 or 3 setting and forget it. Maybe it can alter fan speed but if so it's not noticeable to me.

Where can additional Of the new style Pre-Filters be purchased?

The Blueair website has the pre-filters if you can’t find them here.

I live in the country, lots of dirt + 3 dogs and 2 cats, how often will I need new filter?

Hi there, our formal recommendation is to change the filter every 6 months of continuous use, but you may check your filter periodically and replace it on an "as needed" basis if you prefer.

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BLUEAIR Air Purifier Large Room, Air Cleaner for Dust Pet Dander Smoke Mold Pollen Bacteria Virus Allergen, Odor Removal, for Home Bedroom Living Room, Washable Pre Filter, HEPASilent, Blue 211+ Auto

BLUEAIR Air Purifier Large Room, Air Cleaner for Dust Pet Dander Smoke Mold Pollen Bacteria Virus Allergen, Odor Removal, for Home Bedroom Living Room, Washable Pre Filter, HEPASilent, Blue 211+ Auto

Product ID: 273354904

Details

Brand
BLUEAIR
Color
White
Item Weight
3.33 kg
Power Source
Corded
Product Dimensions
13"D x 13"W x

⚡45% faster filtration

🌿Energy Star 4W low power

🔇67% quieter operation

Description

🌬️ Breathe smarter, live fresher — the future of clean air is here!

SMART AUTO MODE - One-touch particle sensor adjusts fan speed for optimal air quality—effortless clean air all day.
SLEEK SCANDINAVIAN DESIGN - Award-winning minimalist style that complements your modern home or office aesthetic.
WHISPER QUIET PERFORMANCE - Operates at just 23 dB on low—quieter than a whisper, ideal for bedrooms and workspaces.
HEPA SILENT DUAL FILTRATION - Combines mechanical and electrostatic filtering to remove 99.99% of allergens, viruses, and odors down to 0.1 micron.
RAPID LARGE ROOM PURIFICATION - Cleans 550 sq ft in ~12.5 minutes, perfect for living rooms and open spaces.

The Blueair 211+ Auto air purifier delivers ultra-fast, whisper-quiet purification for large rooms up to 550 sq ft in just 12.5 minutes. Featuring patented HEPASilent technology, it removes 99.99% of allergens, viruses, and odors down to 0.1 micron while consuming less energy than an LED bulb. Its smart auto mode continuously monitors air quality and adjusts fan speed accordingly, ensuring effortless, optimal air freshness. With a sleek, award-winning Scandinavian design and washable pre-filter, it’s the perfect blend of performance and style for allergy sufferers, pet owners, and anyone seeking cleaner indoor air.

Specifications

ASIN	B08LQQKD8B
Best Sellers Rank	#1,292,958 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #959 in HEPA Filter Air Purifiers
Brand Name	BLUEAIR
Color	White
Contaminant Filtration Capability	True
Control Method	Touch
Controller Type	Button Control
Customer Reviews	4.4 4.4 out of 5 stars (4,251)
Filter Class	Activated Carbon, Particle
Filter Type	Activated Carbon
Floor Area	550 square_feet
Included Components	Air Purifier, Combination Particle + Carbon filter, Fabric Pre-filter in Arctic Trail, User manual
Item Dimensions D x W x H	13"D x 13"W x 20"H
Item Type Name	Air Purifier
Item Weight	3.33 kg
Manufacturer	Blueair
Model Number	3631101000
Noise Level	23 db
Number of Packs	1
Part Number	106237
Particle Retention Size	0.1 micron
Power Source	Corded Electric
Software Update Supported to Date	unknown
Special Features	Corded
Specification Met	AHAM Certified, CARB Certified, Energy Star Certified
UPC	689122019642 689122018904 689122016214
Unit Count	1 Count
Warranty Description	1-year limited warranty. Extend warranty to up to 2-years with product registration on Blueair.com.

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