Round Single Blade Sealed Damper
This damper design is similar to the non-sealed style damper. To keep leakage to a minimum we have installed spring Stainless Steel in the side jambs along with neoprene gasket on the frame for the damper blades to seal up tightly against.

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Other materials include:
Stainless Steel or Aluminum with some S.S. Hardware

Options:
Nylon Bearings
Sleeves
Quadrants-Galvanized or Stainless Steel
Electric Actuators

See Spec Sheet (pdf format)