15.5X29.5X.75 actual size (16 x 30 x 1 nominal size). Our 16x30x1 air filter is an extended surface pleated filter, which outpaces ordinary air filters with medium efficiency, and are built for lower pressure drop, and longer service life, which reduces HVAC equipment maintenance and energy costs. Our 16x30x1 air filter is measured to ASHRAE test standards 52.2, which assures that the air filter will capture particulate as good or better than original manufacturer 16x30x1 air filters. Pleated design. MERV tested to ASHRAE ratings. 983 cfm flow rate.