9.5x29.5x.75 actual size (10 x 30 x 1 nominal size). This 10x30x1 air filter is an extended surface pleated filter, which outpaces standard air filters with medium efficiency, and are designed for lower pressure drop, and longer service life, which reduces HVAC equipment maintenance and energy costs. The 10x30x1 air filter is graded to ASHRAE test standards 52.2, which establishes that the air filter will capture dust as good or better than original brand 10x30x1 air filters. Pleated design. MERV tested to ASHRAE ratings. 615 cfm flow rate.