20x20x4 MERV 8 Pleated Air Filter 3PK - 19.5x19.5x3.625 - Actual Size H2O International 25x28x2 MERV 13 filters are

25x28x2 MERV 13 filters are right on the cusp of being classified as “medium efficiency MERV pleated air filters” and “high-efficiency MERV pleated air filters

In areas where a lot of larger airborne particles are present

P (psi)@ Flow Rate (gpm): 4

and the Aprilaire 600M Humidifier

20x20x4 MERV 8 Pleated Air Filter 3PK - 19.5x19.5x3.625 - Actual Size H2O International 25x28x2 MERV 13 filters are20x20x4 MERV 8 Air Filter Box of 3 Actual Size of Filter: 19. 5 x 19. 5 x 3. 625 Our goal is to provide the best air filters for every home. While pure air is always our goal, we know that some HVAC units are unable to use higher MERV rating filters. So, we also offer MERV 8 filters. Our 20x20x4 MERV 8 filters are the perfect filters for homes that have older HVAC units. Even though MERV 8 filters are not as efficient as higher MERV rating filters,