18x18x1 MERV 11 Pleated Air Filter 6PK - 17.75x17.75x.75 - Actual Size Carrier Polypropylene non-woven pre-filtration media and

Polypropylene non-woven pre-filtration media and will operate effectively in most installations without pre-filtration

and waterproof housing

Safely removes mineral build-up

Where Used: Cobalt "BASIC"

Chill Water Loop Filtration

18x18x1 MERV 11 Pleated Air Filter 6PK - 17.75x17.75x.75 - Actual Size Carrier Polypropylene non-woven pre-filtration media and18x18x1 MERV 11 Air Filter Box of 6 Actual Size of Filter: 17. 75x17. 75x. 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. 18x18x1 MERV 11 filters are right on the cusp of being classified as medium