Bryant / Carrier Genuine OEM Fan Coil Filter (19.75x21.5x1) KFAFK0312LRG (317659-403) by Carrier MERV 4 rated, replace every 3 months Fits: Carrier, Bryant, and Payne units 19.75 x 21.5 x 1 nominal size, 19.75 x 21.5 x 0.875 actual size - Compatible with: Trane EX1000, TWE060D150, FX4DNB031, FX4DNB037, FX4DNB043, FXDNF031, FX4DNF037, FX4DNF043, Payne PF1MNC036, PF1MNC037, PF1MNC042, PF1MNC043, PF1MNC048, PF1MNCO49 Filter is EOM, washable, permanent, and reduces contaminants, and allergens by using the metal frame