Where is best to place this unit? By the window? Middle of room?

Hi there! Thanks for reaching out! The unit can go anywhere just make sure it's about 6 inches away from any wall or furniture and that all windows and doors are shut.

where can I buy 411 filters, not available on amazon?

Hi there, Amazon does sell the Blueair filters on Amazon. In fact, Blueair has their own website on Amazon here: https://www.amazon.com/s?k=blueair+411+filter&crid=22JFA379FMLFB&sprefix=blueair%2Caps%2C245&ref=nb_sb_ss_ts-doa-p_11_7. Or just type in Blueair 411 filter when you're in Amazon and it goes straight to Blueair's Amazon web page. Hope this helps!

Can i use this with the blueair 411a max model? that model is wider at the bottom, not straight up and down like this filter. thanks!

No. Max units can only take Max filters for the specific model.

Our unit is on auto or night mode in our bedroom, w/ air quality light usually blue. After just 6 weeks, the replace filter reds are on. Normal???

Perhaps remove and clean the lint screen ( wrapped outside covering ) might clear it...plus examine the inside filter at same time. Be mindful of the general air quality in the room ....this unit might be Signalling an issue. Good health to you.

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Blueair Genuine Replacement Filter, Particle + Carbon Filter, Compatible with 3210, Blue Pure 411 & Joy S, F411PACF100929

Blueair Genuine Replacement Filter, Particle + Carbon Filter, Compatible with 3210, Blue Pure 411 & Joy S, F411PACF100929

Product ID: 260854468

Details

Brand
BLUEAIR
Colour
White
Item weight
0.23 Kilograms
Power source
Electric
Product dimensions
20D x 20W x

🌀360° air intake for full-room purification

🌿Activated carbon layer neutralizes odors & VOCs

🛡️HEPASilent tech traps 0.1 micron particles

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Description

🌬️ Breathe brilliance, filter flawlessly.

HEPA SILENT PRECISION - Captures ultra-fine particles down to 0.1 microns for cleaner air
360 AIRFLOW MASTERY - Ensures every corner breathes fresh with full-room coverage
DUAL ACTION FILTRATION - Combines particle and activated carbon filters to eliminate smoke, pet dander, pollen, and odors
EFFORTLESS COMPATIBILITY - Seamlessly fits Blueair 3210, Blue Pure 411 & Joy S models for hassle-free upgrades
GENUINE BLUEAIR ASSURANCE - Maintain peak purifier performance with authentic replacement filters

The Blueair Genuine Replacement Filter (F411PACF100929) features advanced HEPASilent technology and a 360-degree design to trap particles as small as 0.1 microns while activated carbon neutralizes odors and VOCs. Compatible with Blueair 3210, Blue Pure 411, and Joy S models, this authentic filter ensures optimal air purifier performance and cleaner, fresher indoor air.

Specifications

ASIN	B073SLDNJW
Best Sellers Rank	#9,145 in Kitchen ( See Top 100 in Kitchen ) #76 in Air Purifier Filters
Brand Name	BLUEAIR
Color	White
Contaminant Filtration Capability	cigarette_smoke, odors, pet_dander, pollen, volatile_organic_compounds_(vocs)
Control Method	Remote
Controller Type	Remote Control
Customer Reviews	4.7 4.7 out of 5 stars (9,418)
Filter Class	Activated Carbon Filter Class
Filter Type	HEPASilent
Included Components	Filter
Item Dimensions D x W x H	20D x 20W x 10H centimeters
Item Type Name	Filter
Item Weight	0.23 Kilograms
Manufacturer	Blueair
Model Number	100929
Part Number	F411PACF100929
Particle Retention Size	0.1 Micron
Power Source	Electric Corded
Smart Home Compatibility	Not Smart Home Compatible
Special Features	360 degree air, 4x filter surface, combination of particle filters and activated carbon
Specification Met	AHAM Certified
UPC	689122009858
Unit Count	1 Count
Warranty Description	NO WARRANTY

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