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.

ASIN	B073SLDNJW
Best Sellers Rank	#17,733 in Kitchen ( See Top 100 in Kitchen ) #167 in Air Purifier Filters
Brand	BLUEAIR
Brand Name	BLUEAIR
Color	White
Colour	White
Contaminant Filtration Capability	cigarette_smoke, odors, pet_dander, pollen, volatile_organic_compounds_(vocs)
Control Method	Remote
Control method	Remote
Controller Type	Remote Control
Customer Reviews	4.7 out of 5 stars 9,345 Reviews
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
Item weight	0.23 Kilograms
Manufacturer	Blueair
Model Number	100929
Part Number	F411PACF100929
Particle Retention Size	0.1 Micron
Power Source	Electric Corded
Power source	Electric Corded
Product dimensions	20D x 20W x 10H centimeters
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

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

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