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.

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.

Metal-Fab Inc. manufactures fire dampers and ceiling radiation dampers. The company's two types of fire dampers - static fire dampers and dynamic fire dampers - close wither when a HVAC system's blower is running or not running. The two fire dampers are classified to UL standard 55 and feature a one hour or three hour fire ratin. The ceiling radiation dampers carrying a 3-4 hour rating, and are installed in the throat of a ceiling diffuser or return grille.