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.

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.

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.

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

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.

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.