Advanced Valve Design Inc. manufactures fabricated dampers, light-duty dampers, FRP dampers, and special dampers. The FRP dampers are available in butterfly, louver, and guillotine types; while the special dampers are designed for temperatures up to 2800F - with tadpole, clearance, scissors, and step seat styles. The light-duty dampers are intended for use in HVAC systems and low pressure industrial applications, with frames and blades that are comprised of 12 to 16 gauge construction. The fabricated dampers are designed for higher temperature applications up to 2200F, and feature a number of seating configurations: scissor, metal-to-metal, step, resilient, tadpole, and teflon o-ring.

Effox-Flextor designs and manufactures guillotine/slide gate, louver, diverter, stack isolation, butterfly/wafer, poppet, and radial vane-type dampers. Depending on type the dampers are used for precise flow control, cement plant, power plant, power boiler isolation, turbine, reverse gas flow, outlet flow, bypass flow, and fan inlet control applications.

Flextech Industries Ltd. manufactures butterfly dampers, guillotine dampers, radial vane dampers, louver-bladed dampers, and diverter dampers. The butterfly dampers are for applications that feature up to 2,000F of gas temperature including clean, corrosive, dirty and dry environments. These dampers are available with various seal designs including swing through, step, tadpole, and step with perimeter seal.

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.

Kelair Products Inc. designs and fabricates butterfly dampers, guillotine dampers, louver dampers, diverters and tee dampers. The butterfly dampers are available for temperatures up to 1600F and differential pressures up to 6 psi. The guillotine dampers are available in 10" to 84" sizes, and are round or square shaped; while the louver dampers are for operating temperatures up to 1600F. The diverters/tee dampers are for process air or gas diversion applications.

Nuaire Laboratory Equipment Supply manufactures 14 gauge stainless steel butterfly dampers that feature manual or electric design for various exhaust applications.

Orbinox designs and manufactures butterfly dampers, multiple diverter dampers, louver dampers, diverter dampers, stack dampers, three level valve dampers, and goggle dampers.

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.

Bachman Industries Inc. engineers and manufactures 4-port dual diverter dampers, iso-flex guillotine dampers, iso-spade guillotine dampers, louver and double louver dampers, butterfly dampers, retracto-seat guillotine dampers, single louver dampers, five blade-type isolation dampers, and zero-leakage toggle disk dampers. The isolation dampers are used in steel mill applications, while the toggle disk dampers are found in wood chip gasification plants.

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.

Damper & Control Systems LLC engineers and manufactures heavy-duty butterfly, multi-louver, guillotine, diverter, and vortex dampers used by industrial process air handling systems. The butterfly dampers can be actuated pneumatically, electrically, or manually; and can feature 100 percent sealing efficiency with the addition of twin seals and a sealing air fan.

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.