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Round Spring Return 2 Wire Damper. Durozone NSPRD 2 wire spring return dampers series. Best quality spring return residential grade damper. 5 Year warranty, internal spring mechanism, 24volts AC, Field Reversible! easy to make normally open or normally closed.
Retrozone's Slip In Series of Retrofit Slip In Dampers allows easy damper retrofit to sheet metal ducts that are already installed, where it would be difficult to cut out a complete length of pipe to install a traditional mechanical damper.