This unique air conditioner filter was designed to solve the problems common to other air conditioner 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 HealthSmart Filters are up to 30 times more effective in capturing harmful fine particles, compared to those blue throw away type air filters. "If it doesn't fit, It doesn't filter" That's why we make our filters in over 200 sizes, but we don't stop there. Because air filter tracks have imperfections, design flaws and metal to metal seals that allow severe bypass, Air Sponge filters incorporate a patented anti-bypass seal compensate for these flaws. No bypass means your filtering 100 % of the air. The HealthSmart Hinge filter frame is designed to easily accommodate pleated refill pads. MicroSponge Electrostatic Air Filter pads composed of a highly effective blend of two new electrostatic polymers which, when combined, magnify dust-trapping capabilities. MicroSponge filter pads have a high stable charge on every individual fiber of the electrostatic air filter surface. This active charge works very effectively in capturing and retaining sub-micron particles.