3M - Filtrete 25 in. H x 20 in. W x 4 in. D Air Filter

3M Filtrete 25 in. H x 20 in. W x 4 in. D Air Filter Filter Frame Material: Chipboard, Filter Type: Furnace, Micro Particle Performance Rating: 1000 MPR, Minimum Efficiency Reporting Value: 11 MERV, Number in Package: 2