Maintain a 20 to 60 feet per minute velocity at the front edge. The edge velocity is in part related tothe speed of exhaust gases entering the filters but diminished by the distance away from the samefilter. Large filters will cause low air pressure drop and very low edge velocity.2) The filters are installed in a vertical position to no less than 45 degrees off horizontal plane. Theefficiency of these filters is approximately 50 to 60%, by weight.3) Filter hoods are referred to as Bulletin 96 canopies, a reference to NFPA Bulletin 96 which governsconstruction requirements for commercial kitchen applications. Underwriters Laboratories establishesthe standards for the filters, which are known as UL Classified Filters.
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