18x24x1, Purolator Hi-E 40 Extended Surface Pleated Air Filter, Mechanical MERV 8, (6 Pack)

The Hi-E 40 is a medium efficiency pleated filter, available in 1", 2" or 4" depths and many standard face sizes to accommodate most system requirements. The 100% hydrophobic synthetic media provides nearly 95% average arrestance. 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. Fully utilizing every square inch results in a slow steady rise in resistance for maximum dust holding capacity. In addition to removing dust, pollen, and lint in your living and working space, they will actively find and trap harmful pollutants like mold, preventing allergy and asthma triggers, promoting a healthier, safe environment. Hi-E 40 filters will not rack or warp under normal operating conditions. The Hi-E 40 line has lower resistance levels to aid in your energy savings goals and objectives. Gain 1 Point toward LEED Certification - During the process of new construction, install MERV 8 filters at each return air grille for air handlers used during construction. Conduct a two-week building flush out with new air filters and 100-percent outdoor air prior to occupancy. Rated Efficiency: Hi-E 40 filters are rated MERV 8 per AHRAE 52.2-2007. Underwriters Laboratories, Inc. Classification: Hi-E 40 filters are classified U.L. Class 2 per U.L. Standard 900.Actual Size: 17-3/8 x 23-3/8 x 3/4