Features:

• Fits all Blueair 501 and 601 model air purifiers
• All three included filters required for one filter change
• Easily installed - simply open the unit's lid, lift out and drop in filters every 6 months

Editor Reviews:

Product Description:
Replacement Particle Filter for Blueair 500/600 series air purifier (set of three) for the Blueair model 501 and 601 air purifiers. One complete filter change - 3 standard HEPASilent filter of polypropylene (traps particles) and activated carbon (removes odors and gases).

Rating : - Great Particle Filter
I have used the Blueair 500 series filter unit for years. It really absorbs the home dust and is a quality made product.