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. Available with or without handles. CAUTION: Malco Dampers are designed for forced air systems, they are not capable of being used in wood, coal, or other similar systems.
- Available with or without handles
- Bulk unassembled dampers available
- Bearings allow bearing holes to be made in round duct
- Insert damper into pre-punched bearing hole
- Pipe Diameter: 7 in. (178 mm)
- Bearing: Double
- Gauge: 28
