14.5x29.5x.75 actual size (15 x 30 x 1 nominal size). The 15x30x1 air filter is an extended surface pleated filter, which outpaces standard air filters with medium efficiency, and are built for decreased pressure drop, and longer service life, which reduces HVAC equipment maintenance and energy expenses. Our 15x30x1 air filter is rated to ASHRAE test standards 52.2, which ensures that the air filter will function as good or better than original manufacturer 15x30x1 air filters. Pleated design. MERV tested to ASHRAE grades. 922 cfm flow rate.