This filter is a compatible replacement filter for the Honeywell FC40R1029 return grill filter. It has a MERV 10 efficiency rating and captures small indoor air contaminants like pet dander, pollen and dust.
Nominal size: 20x30x4-3/8
Actual size (without header): 28-1/4 x 18-1/4 x 4-3/8
Actual size (with header): 19-3/4 x 29-3/4 x 4-3/8
Also known as FC40R-1029.