Actual size is 15.88 x 24.88 x 4.38. Brand: Accumulair. 16x25x5 Honeywell X8306 replacement whole house filters, exactly built to be an alternative to the original manufacturer Honeywell X8306 filters. Fully constructed so no assembly or combs needed. MERV classified to ASHRAE 52.2 test standards assuring particle capture as good or better than the name brand Honeywell X8306 filter. Notice: The example air filter picture as displayed is not true to size and is there to show configuration only. Trade names and Honeywell X8306 P/N are used for filter replacement identification purposes.