The KFAFK0312LRG Fan Coil Filter Replacement is fully compatible with Trane EX1000, TWE060D150, FX4DNB031, FX4DNB037, FX4DNB043, FXDNF031, FX4DNF037, FX4DNF043, Payne PF1MNC036, PF1MNC037, PF1MNC042, PF1MNC043, PF1MNC048, PF1MNCO49. The KFAFK0312LRG Fan Coil Filter is built to last and provide 6 months of effective filtration before needing replacement. Normal Size: 19.75 x 21.5 x 1. Actual Dimensions: 19.75 x 21.5 x 0.875. Package included: 2 X KFAFK0312LRG Fan Coil Filter Replacement Disclaimer: This is not an OEM product and is not covered under any OEM warranty. Any use of the brand name or model designation for this product is made solely for purpose of demonstrating compatibility.