Fox Equipment engineers louver dampers, slide gate dampers, wafer/butterfly dampers, diverter/flap dampers, radial vane/VIV/IVC dampers, stack isolation dampers, and poppet dampers. The louver damper are available as parallel, opposed, and double types. The slide dampers are available as low leak and zero leak models; with the wafer/butterfly dampers used in round duct applications. The diverters/flap dampers are used in gas turbine applications, and the radial dampers provide flow control for fan inlets.

ProcessBaron designs and manufactures louver dampers, butterfly dampers, vortex vane dampers, diverter dampers, slide gate dampers, and stack dampers. The diverter dampers are for process and heat applications, while the slide gate and stack dampers feature low to zero leakage. The vortex vane dampers feature a counter levered blade, with the butterfly dampers available with round, square or rectangular blades.

Control Equipment Co. Inc. designs and manufactures dampers for industrial service including butterfly, louver, gate, and diverter types. The company also produces specialty dampers types including: goggle-type slide gate, radial vane inlet, stack cap, and refractory lined.

Joiner Systems Inc.engineers damper types including: louver, butterfly, guillotine, slide gate, diverting, stack cap and flap isolator, and poppet. All the dampers are designed to withstand high pressures, temperatures, and corrosive gases found in processing systems.

Mader Dampers - a division of Mader Machine Inc. - specializes in manufacturing butterfly dampers, louver dampers, inlet vane dampers, tee dampers, poppet dampers, guillotine dampers, slide gate dampers, and specialty 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.