Aerostar 21 1/2×23 5/16×1 MERV 13 High Efficiency Pleated Air Filter, 4-Pack,…
Comparable to MPR 1900 / FPR 10. Actual size 21.5×23.3125×0.75. Extends furnace and AC life while lowering energy costs. Air Filter Construction: Pleated. Unit Count: 4.0 Count. Filter Shape: Rectangular.