17 1/2 x 23 1/4 x 1" HealthSmart Filter with (1) year supply of BioSponge Plus pads

This totally unique air filter was designed to solve the problems common in other air filters. The combination of it's perfectly sealed aluminum frame, and our advanced air filtration inserts, puts this air cleaning system... in a class by itself. In fact Air Sponge Filters are up to 30 times more effective in capturing harmful fine particles, compared to those blue throw away type air filters. We invite you to come join over 250,000 satisfied users, and experience the true pleasure of breathing pure air!