Composites USA has been manufacturing fiberglass, thermoplastic and stainless steel dampers in a variety of styles since the company's inception. Shown below are views of some of our fiberglass dampers. These are typically used for throttling (butterfly style), shut off (slide gate) or backdraft. Where required, multiple blade dampers, either parallel or opposed blade, have been provided. Our standard general purpose design is the style #300 butterfly and style #325 slide damper. These are available with options including flanged ends, shaft seals, electric or pneumatic actuation, hand and chain wheels, blade seals and blade stops. As with our other products, all dampers are available in Factory Mutual Approved Dual Guard or Standard Class 1 flame retardant materials. Shown above: 48" diameter manually operated dampers on truck, 60" diameter electrically operated dampers on the shop floor, 24"x72" electrically operated opposed blade damper in production. All the above incorporate Viton blade seals and Teflon shaft seals. Shown above: Severe service 12" x 38" rectangular throttling damper, 18" diameter butterfly damper with flanged shaft seals and fiberglass actuator mount, 48" diameter Style #350 FF flanged back draft damper.