Aerostar 21 1/2×23 5/16×1 MERV 8 High Efficiency Pleated Air Filter, 6-Pack, …
Comparable to MPR 600 / FPR 5. Actual size 21.5×23.3125×0.75. Extends furnace and AC life while lowering energy costs. Air Filter Construction: Pleated. Unit Count: 6.0 Count. Compatible Devices: Air Conditioner, Furnace.