- Knob-Operated worm gear adjusts patented Butterfly Valve
- Only 2-1/2 Turns to Full Open or Close
- Controls Volume - Not Air Pattern Minimum Air Restriction
- Galvanized & Painted Steel Damper
- Steel Ring Has Brown Finish
- Includes Adjusting Handle
- Duct Size: 8"
- Overall Size: 8"
|Country of Origin||US|
|Manufacturer Name||AMERICAN METAL PRODUCTS|
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