United Equipment & Fabricators offers both square and round fiberglass dampers.

Square Dampers

Frame:  Fiberglass,

             Vinyl Ester Resin

Blade:  Fiberglass,
           Vinyl Ester Resin
 
Axle:  Pultruded Fiberglass,
         Vinyl Ester Resin
 

Bearings:  Molded FRP

Control Shaft:  Axle extends 6" beyond frame; Complete with FRP hand quadrant
 
Sizes: 
  Minimum 6" wide x  6" high 

  Maximum 48" wide x  48" high

Maximim Temperature: 
  200 degrees Farenheit
 
Maximum System Pressure: 
  +/- 10 w.g.
 

Maximum Velocity:  2000 fpm

 Round Dampers

Frame:  Fiberglass Channel,

             Vinyl Ester Resin

Blade:  Fiberglass,
           Vinyl Ester Resin
 
Axle:  Pultruded Fiberglass,
         Vinyl Ester Resin
 

Bearings:  Molded FRP

Control Shaft:  Axle extends 6" beyond frame; Complete with FRP hand quadrant
 
Sizes:  4" - 60" Diameter
 
Maximim Temperature: 
  200 degrees Farenheit
 
Maximum System Pressure: 
  +/- 10 w.g.
 

Maximum Velocity:  2000 fpm