18x20x2 MERV 13 Pleated Air Filter 6PK - 17.5x19.5x1.75 - Actual Size 18x30x1 a 16x25x4 furnace filter with

a 16x25x4 furnace filter with a MERV rating of 13–16 removes and captures smaller particle sizes even before the filter starts to become dirty

50% greater dirt-holding capacity

waterborne parasites

Highest total capacity

20x24x1 MERV 13 Air Filter - Box of 6

18x20x2 MERV 13 Pleated Air Filter 6PK - 17.5x19.5x1.75 - Actual Size 18x30x1 a 16x25x4 furnace filter with18x20x2 MERV 13 Air Filter Box of 6 Actual Size of Filter: 17 1 2 x 19 1 2 x 1 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 13. 18x20x2 MERV 13 filters are right on the cusp of being classified as medium