Actual size is 19.5 x 24.5 x 3.75. Brand: Accumulair. 20x25x4 White-Rodgers ACM2000M-108 compatible whole house air filters, specifically constructed to replace original brand White-Rodgers ACM2000M-108 air filters. Completely box-formed - no forming or combs required. MERV rated to ASHRAE 52.2 test ratings assuring particulate filtration as good or better than the original manufacturer White-Rodgers ACM2000M-108 filters. Note: Example air filter image as shown is not the actual dimensions and is displayed for design purposes only. Company names and White-Rodgers ACM2000M-108 part numbers included for air filter style identification.