This is a compatible replacement filter for the Honeywell FC40R1128 14x24 return grille filter. This filter has a MERV 10 efficiency rating which allows it to capture particles like pet dander, pollen and dust.
Nominal size: 14x24x4-3/8
Actual size (without header): 12-1/4 x 22-1/4 x 4-3/8
Actual size (with header): 13-3/4 x 23-3/4 x 4-3/8
Also known as FC40R-1128.