The HSL Series Horizontal Cartridge collector is a heavy-duty reverse pulse-jet collector that is suited for industrial powders and sub-micron dust applications. These units operate with a downward airflow, generous drop out area, and incorporates our patented Uniflow Supersonic Nozzle™ based cleaning technology, internal air baffle, and special attention to the internal air flow velocities and patterns. The HSL Series cartridges are sealed and held in place by a patented spring-loaded door and reinforced three rod support cages. This patented door assembly makes a cartridge change quick and easy, insures proper cartridge tension, and insures a positive seal. Ownership of an SDC HSL Series collector can expect to enjoy a longer filter life, and a lower cost of ownership.