SL-HR is a high ratio, horizontal cartridge collector that features a patented cleaning system and internal inlet baffle. These features, along with the collector's air plenum, allow it to operate with standard round cartridges at much higher CFM volumes per cartridge. Design means initial cost savings due to a smaller collector with fewer cartridges. It continues to pay back over its entire service life with fewer replacement cartridges. Scientific Dust Collectors 4101 W. 126th Street Alsip, IL, 60803-1996