Filter-Monster Compatible with Blueair 400 Series Particle Filter 3-Pack

I’m happy with this filter. It’s fits perfect in my blue air 403. Air flow seems the same, but I usually keep on low. Super easy to replace. As some have mentioned, there was a slight plastic smell at first but it went away in a day of running it.

Some firms try to imitate the original and obtain sales by selling at a lower price than the original. I use new Filter-Monster filters every six months for my Blueair 400 air cleaners. They are cheaper than the original, but I find they perform just as well as the original. That's why I continue to buy Filter-Monster. Take a look at the ratings for the Filter-Monster replacement filters for other brand air cleaners. They all receive excellent scores.

This is a fantastic filter

Great, quality filter replacement at a very competitive price.

fits, works just fine.

Quality Plus!

Fits like a glove. Direct replacement for our 10 plus year old and going strong Blueair air purifier. Works perfectly.

With the OEM Blueair filters skyrocketing in price over the years, I decided to try this after market filter. Everything seems identical to the OEM Blueair filter. Even the writing on the filter looks like the OEM Blueair filter. My filter was used so I could tell them apart, but if a new OEM Blueair filter and this filter was mixed up like the shell game, I couldn't tell them apart. It fit into my machine the same way as the OEM Blueair filter fit and the machine seems to function just like it does with the OEM Blueair filters.

Je suis enchantée de votre produit , purificateur performant et je suis satisfaite . Céline Lussier

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