This filter is a compatible replacement filter for the Honeywell FC40R1078. It has a MERV 10 efficiency rating.
Nominal size: 24x24x4-3/8
Actual size (with header): 23-3/4 x 23-3/4 x 4-3/8
The Magnet logo on this page signifies that this product is a factory direct replacement to the OEM branded filter.