Purolator hi-E 40 Medium Efficiency Pleated Air Filter The Purolator hi-E 40 is a medium efficiency, extended surface, pleated air filter. The media area and initial air flow resistance have been carefully balanced while maximizing dust holding capacity. Filter MediaA lofted, non-woven pleated filter media composed of non-dyed, natural cotton and synthetic fibers makes up the hi-E 40 media. This fiber blend provides a 25-30% average efficiency and a 90-93% average arrestance and maximizes dust retention capabilities.Filter Closure FrameThe hi-E 40 filter elements are enclosed in a two piece heavy duty, .028 high wet strength beverage board frame. When assembled, the fully bonded double wall frame combines with the integral corner flaps and forms a rugged, durable filter which will not rack, warp, or leak under normal operating conditions.Pleat ConfigurationThe filter media derives its support from being continuously bonded to a corrosion resistant, 28-gauge, expanded metal grid allowing a 95% open face area. This media/backing configuration is formed into aerodynamic wedge-shaped pleates. To eliminate the possibility of dirty air bypass, the media pack is securely bonded to the periphery of theenclosure frame with solvent-free water based glue. |