The #300Q w/Quadrant Damper is available in 14 common sizes from 4'' through 24'' diameter pipe #300Q w/Quadrant Dampers are packaged 50 to a carton
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Type Duct Damper
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Gauge 28 ga
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Damper Size 4 in
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Submittal Sheet
https://www.shearersupply.com//ASSETS/DOCUMENTS/ITEMS/EN/M_M_Manufacturing_300Q-04_Submittal_Sheet.pdf
Standard/Approvals: ASTM-A653 CS B