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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Size 6 in
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Gauge 28 ga
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Damper Size 6 in
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Catalog
https://assets.unilogcorp.com/267/ITEM/DOC/M_M_300D14_Catalog.pdf
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Specification Sheet
https://assets.unilogcorp.com/267/ITEM/DOC/M_M_300Q12_Specification_Sheet.pdf
Standard/Approvals: ASTM-A653 CS B