Customer Reviews for Blueair - F4MAX Replacement Filter for 411i Max & 411a Max Air Purifiers AHAM Certified HEPASilent 99.97% Particle & Odor - Black
Customer Rating
4
Excellent Air filters
on April 29, 2026
Posted by: Melvin B.
from US, United States
We love the way these work. They do a great job for us. We have three in different areas. Two of the machines have developed a low grinding sound. We have changed filters and cleaned them, but can't get rid of the noise.
We love both our Blueair Filters. I only have one candle left that's not battery operated. When I light it in the kitchen that is about 30' away from the filter it turn to red. Amazing.
Have been using this 411a for about 2 years, packaged with a filter subscription and very happy with it. Even though I don't have the benefit of a wifi connection, the sub reminds me to do filter changes, & I do see a difference in the room's air quality. I run it 27/7 and it is very quiet.
I bought the wrong filter / I have the old model 411 and now can't find filters for them - I thought these would fit and they do in not - can I return them?