The drawing illustrates a manual volume damper installed inside an insulated duct. Key components include a 1/2-inch round rod pin, damper blade, inside and outside end bearings, an insulation stand-off, a handle with a locking quadrant, and specified clearances for proper operation.
Text on the drawing
1/2" ROUND ROD PIN DUCT OUTSIDE END BEARING DAMPER BLADE 1/2" CLEARANCE ALL AROUND INSULATION INSULATION STAND-OFF HANDLE WITH LOCKING QUADRANT INSIDE END BEARING SECTION INSULATION DAMPER BLADE STIFFEN BLADE AS REQUIRED HANDLE WITH LOCKING QUADRANT DUCT SIDE ELEVATION
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