Single-blade damper|Shipped as power open/spring return closed damper|Quiet operation|Can be field-converted to power closed/spring return open damper|Blade closes off tightly against gasket for minimal leakage|Male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct|0 sec power closed/10 sec spring return|M1-power terminals M6 Common|M6 common terminal