•Adjustable close position range stops
•Shipped as power closed/spring return open damper.
•Available in 5 to 10 inch, 12, 14, 16, 18, and 20 inch diameter sizes.
•Male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct.
•Rated to operate up to 1 in. wc.
•Blade closes off tightly against gasket for minimal leakage.
•Fail-safe, normally open operation.
•Simple, easy-to-wire, two-wire (M1 and M6) installation.
Optional third wire (M4) powers LED in open position only (does not power motor)
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Answer provided by: Kris (2/27/2017)