- Adjustable Closed Position Range Stops
- Male (Crimped) and Female (Uncrimped) Ends to Connect to any Rigid or Flexible Round Duct
- Rated to Operate Upto 1 Inch WC
- Blade Closes Off Tightly Against Gasket for Minimal Leakage
- Fail-Safe, Normally Open Operation
- Simple, Easy to Wire, 2-Wire (M1 and M6) Installation