13.5X13.5X.75 actual size (14 x 14 x 1 nominal size). The 14x14x1 air filter is an extended surface pleated filter, which exceeds standard air filters with medium efficiency, and are built for lower pressure drop, and increased service life, which reduces HVAC equipment maintenance and energy expenses. This 14x14x1 air filter is governed to ASHRAE test standards 52.2, which ensures that the air filter will operate as good or better than original brand 14x14x1 air filters. Pleated design. MERV graded to ASHRAE standards. 402 cfm flow rate.