20x20x4 Furnace Air Filter MERV 11 Exact Size 19 3/8 x 19 3/8 x 3 5/8. Case of 4 by FurnaceFilters.Ca
- 20 x 20 x 4 Pleated Filters
- Actual Size 19 1/2" x 19 1/2" x 3 3/4"
- Exact Replacement for 3M Filtrete 20 x 20 x 4 Air Cleaning Filter
- MERV 11 Rated
- Made In Canada by FurnaceFilters.Ca
- Case of 4