Blueair 400 Series HEPASilent Particle Filter

It does what it is suppose to do.

I've been using the 402 filters for years. At night I close my bedroom door and turn on my Blue Air machine. I have noticed that my asthma and allergies really benefit from breathing cleaner air at night. I only use these genuine blue air filters so I know that I'm getting full benefit.

This filter is easy to install. It fits my ancient 402. The filter's side which is wire covered goes towards the front of the machine, where the controls are. The all white filter part, obviously to the back. My cousin had removed my filter so I didn't know which way to put it in. Online customer service answered my inquiry promptly. Thanks ABC.

The larger unit of the two that I have developed an annoying high pitched hum so I had to give it away to someone who wasn’t using it in their bedroom. But it had worked very well in the five years I had it. The smaller unit is still very silent.

I chose older models of BluAir air cleaners because of their rugged construction, simplicity, and quiet reliable motors.This filter lasts exactly 6 months in my home,and is by that time obviously somewhat dirty.I usually stick with genuine filters, despite their higher cost. Allergy Byers Club seems to have the best price on the internet.