20x24x4 MERV 11 Pleated Air Filter 3PK - 19.375x23.375x3.625 - Actual Size 18x25x2 This is the replacement filter

This is the replacement filter only

The Sterilight BA-ICE-CM Replacement Ballast for All Cobalt Plus Series Models offer both an audible and visual alarm that allows for simple troubleshooting in the field

Polyester Pleated Cartridges are suitable for a variety of uses and can be used in residential

100% polypropylene media

20x24x4 MERV 11 Pleated Air Filter 3PK - 19.375x23.375x3.625 - Actual Size 18x25x2 This is the replacement filter20x24x4 MERV 11 Air Filter Box of 3 Actual Size of Filter: 19. 375 x 23. 375 x 3. 625 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. 20x24x4 MERV 11 filters are right on the cusp of being classified as