This is a compatible version of the Honeywell FC40r1144 return grille filter. It has a MERV 10 efficiency rating which enables it to capture unwanted indoor air pollutants like pollen and pet dander.
Nominal size: 20x24x4-3/8
Actual size (with header): 19-3/4 x 23-3/4 x 4-3/8
Also known as FC40R-1144.
The Magnet logo on this page signifies that this product is a factory direct replacement to the OEM branded filter.