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Producer of low-profile subduct risers for multistory buildings.

The LSR is a manufactured product used to penetrate fire-resistance-rated shaft enclosures in multistory buildings. The LSR is utilized when exhausting individual or multiple bathroom, clothes dryer, kitchen or kitchen-hood exhaust ducts to the building's main exhaust shafts. Meeting the requirements of the latest codes and standards, the LSR is manufactured with four connection sizes: 4, 6, 8, and 10 inch.

Utilizing the LSR in conjunction with a termination-mounted exhaust fan mitigates the requirements for fire and smoke dampers. The removal of these dampers not only lowers costs, but the LSR is typically installed for less compared to field-erected subduct risers. In addition, the LSR's low profile allows the exhaust shaft's area to be reduced.