Actual Dimensions: 15.5 x 24 x 4.25. Accumulair brand 16x25x5 White-Rodgers FR1400U-110 substitute whole house filters, specifically constructed to replace the OEM White-Rodgers FR1400U-110 air filters. Completely box-formed so no forming or combs needed. MERV classified to ASHRAE classifications ensuring particle capture to the level of the original brand White-Rodgers FR1400U-110 air filter. Notice: Example air filter picture as displayed is not true to size and is shown for configuration purposes. Name brands and White-Rodgers FR1400U-110 part numbers used for filter style identification purposes.