Air Filter, 18x18x2 Hi-E 40 - MERV 8 (6 Pack), Purolator, Mfr#: 18x18x2x1 HI (6 Pack)

The Hi-E 40 is a medium efficiency pleated filter, The 100% hydrophobic synthetic media provides nearly 95% average resistance. The Hi-E 40 is effective as a stand-alone filter or prefilter. All Hi-E 40 filters are designed with a consistent pleat shape on predetermined centers causing dirt to collect evenly over the entire surface of the media.