Blueair Classic 400 Series Replacement Particle Filter

Amazing to see the fine dust particles floating in the air, visible from sun rays shining through the windows get sucked into the purifier and trapped in the filter. Doesn't take long to clear the air.

This filter is seriously impressive! After the recommended six months, I pulled it out expecting some dust—but I was shocked by how much it had actually collected. It was completely layered with dust and looked absolutely disgusting! 😳It’s amazing to see just how much dust this filter catches and keeps out of the air. Six months later, the proof was right there on the filter. If you’re wondering whether it really works, just look at what it collects!

Great price! I subscribed for auto shipments to help make sure I have good air for me, wife & our 4-legged kids

The blue air 400 series air filter machine has served me for years. It’s the perfect solution to keep the air fresh and clean in my basement. I am thrilled that the filters can be sent to me automatically twice a year. Keep up the good work love your product.

During the winter months, when the windows are always closed, I've noticed that there’s hardly no dust in the house