Actual dimensions are 16.13 x 25.75 x 4.88. Accumulair brand 16x26x5 White-Rodgers FR1400-100 substitute whole house filters, exactly engineered to replace the OEM White-Rodgers FR1400-100 filters. Completely box-formed - no forming or combs required. MERV graded to ASHRAE 52.2 test standards assuring particulate filtration to the level of the original brand White-Rodgers FR1400-100 filters. Notice: Sample filter picture displayed is not the actual dimensions and is included to show configuration only. Trade names and White-Rodgers FR1400-100 P/N are listed for air filter replacement identification purposes only.