18x20x2 MERV 11 Pleated Air Filter 6PK - 17.5x19.5x1.75 - Actual Size H2O International Undersink Water Filters 18x25x1 MERV 13 filters are

18x25x1 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

This happens more effectively as the filter gets dirty

Capacity: 80 GPH

Replace filter every 6 months or 200 gallons to maximize contaminant reduction

18x20x2 MERV 11 Pleated Air Filter 6PK - 17.5x19.5x1.75 - Actual Size H2O International Undersink Water Filters 18x25x1 MERV 13 filters are18x20x2 MERV 11 Air Filter Box of 6 Actual Size of Filter: 17. 5x19. 5x1. 75 Air filters are ranked in a minimum efficiency rating value (MERV) system. The higher the MERV rating, the better the filter can filter out all airborne particulates. Since we are constantly trying to improve indoor air quality, it only makes sense that we would offer air conditioner filter MERV 11. 18x20x2 MERV 11 filters are right on the cusp of being classified as medium