Purolator® Hi-E™ 40 Class 1 Pleated Filters Are Medium Efficiency Filters For Use In Systems Requiring UL Class 1 Listed Support.
Filter media is 1/4" thick high density ultra-fine fiberglass reinforced by a woven fiberglass mesh. Wedge shaped pleats are formed and supported using corrosion resistant, electro-galvanized expanded steel. Filter media is bonded to the expanded metal to prevent media sagging. MERV 8 rated. Meets ASHRAE test standards. Class 1 UL listed.