Replacement Smokestop Filter Set Compatible with Blueair Classic Series 500/600, 501 503 510 550E 555EB 601 603 650E 505 605 Air Purifiers,H13 HEPA

They block most of the air flow, definitely not buying again.

Seems to work better then the original bluair filters. And it's much cheaper

Have been using these air filters for about 5 year on my Blueair 500 system. Solid construction and good airflow (not restricted). Have tried couple other aftermarket filters in the past, but they were very restrictive. Save some money over the Blueair mfg stock.

Arrived on time.

I have a lung condition that requires I have this kind of filter. Works great and not have to pay the full price of the authentic filters. Highly recommend

Buy it it works