BLUEAIR Classic 500/600 Series Genuine Dual Protection Replacement Filter; fits Classic 580i, 680i, 501, 503, 505, 510, 550E, 555EB, 601, 605

Pricey but great quality. Keeps the Classic Blueair working like a charm.

Fit perfectly! No issues to date. Because of where we live, we only have to replace our filters every two years so these are worth the investment. I was surprised when I pulled out the old filters at all the dust they had accumulated. The air cleaner and filters work well.

I tried an off brand filter which had an unpleasant odor and did not get rid of kitchen odors in living room. I went back to the original Blue Air smoke block filter (which works great for allergies also). More expensive, but worth it in my opinion. This filter clears out kitchen cooking odors and light smoke from frying. It also works well for reducing airborne allergens. I have a 750 sq ft living/dining room area which the Blue Air 605 works great!

I've been using these filters for about 8 years. They are really good and normally more expensive elsewhere.

Excellent filter