Continental Fan Manufacturing produces IRIS dampers, IRIS-S stainless steel dampers, motorized dampers, positive seal dampers, and backdraft dampers for office building, pharmaceutical, clean room environment, laboratory, and corrosive environment applications. All the dampers feature accurate air balancing to +/-5 percent, capacities of 15 cfm to 4,000 cfm, and 2" to 12" diameters.

Greenheck manufactures damper products for fire and smoke control in life safety systems, and for airflow control in commercial HVAC and industrial systems. Damper types include: fire, ceiling radiation, combination fire-smoke, smoke, commercial control, balancing, relief, backdraft, heavy-duty/industrial, tunnel transit, bubble tight, and marine.

KB Duct produces backdraft dampers that are constructed of a fully-welded 1/4" plate box and a heavy internal flap door that closes against the incoming duct. The dampers keep dirty air and material from returning to a facility.

Lloyd Industries manufactures air control dampers, backdraft dampers, ceiling radiation dampers, combination fire and smoke dampers, and fire dampers for the HVAC industry.

Ruskin manufactures a line of dampers including: backdraft and pressure relief dampers, commercial control dampers, insulating control dampers,  industrial backdraft and pressure relief dampers, industrial round dampers, rectangular dampers, bubbletight dampers, heavy-duty dampers, pressure seal dampers, ceiling dampers, combination fire and smoke dampers, corridor dampers, fire dampers, marine fire dampers, and smoke dampers.

Vent Products Co. Inc. distributes custom dampers and louvers including: combination louvers/dampers, fire dampers, backdraft dampers and shutters, and air control dampers. The 2" to 4-1/4" wide fire dampers are available in vertical or horizontal mounting, and designed for medium and high pressure duct systems. The air control dampers are designed for precise air flow control to suit all supply, return, outside, and exhaust air applications.

Belco Manufacturing Co. builds fiberglass round dampers and backdraft dampers available in sizes from 6" to 72", and with a maximum operating temperature of 200F. Depending on type, the dampers are used to control airflow for a balancing system, isolating a system with low leakage, or preventing air from flowing back into a system when a fan is turned off. One of the damper models features a PTFE encapsulated O-ring that provides a watertight seal.

United Enertech manufactures various and specific types of backdraft dampers, rectangular dampers, rectangular industrial dampers, round dampers, round industrial dampers, small motorized rectangular dampers, and small motorized round dampers.

Western Pneumatics Inc. designs and fabricates a number of damper types including: backdraft, backflow, butterfly, wafer, radial, blade, rotary, inlet vane, vane, inlet box, variable inlet vane, guillotine, and louver. The dampers can be actuated or manual, and are sued for low pressure, pneumatic conveying systems.