This case of (3) quality replacement filters match the Honeywell filter no. FC100A1003.

This filter comes with a MERV rating of 8 (MERV Rating of OEM part is also 8). The higher the MERV rating, the higher the arrestance of particulate matter (or said differently, a higher MERV means more filtration).

Nominal Size: 16" x 20" x 5" (Actual: 15 7/8" x 19 1/2" x 4 3/8")