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- 1/4” (6.4 mm) bearings allow bearing holes to be made in round duct with the use of a scratch awl. Squeeze pipe so that it is oval shaped. Insert damper into pre-punched bearing hole(s). Pipe will spring back to round when released. Secure with wing nut(s) provided. Damper may be adjusted with screwdriver or optional damper handle.
- Malco Dampers are designed for forced air systems, they are not capable of being used in wood coal, or other similar systems.
- Wing Nut, Handle
- Damper Size7 inDomestic / ImportDomesticMaterialSteelTypeSingle Bearinggauge28 gaManufacturerMalco ProductsManufacturer #D7ASTShapeRound