Round duct volume damper assembly with hardware callouts. The 16-gauge galvanized blade is sized one-quarter inch less than the duct diameter and features 1-inch by 1/8-inch galvanized straps spot-welded to the blade. A three-eighths-inch square operating rod runs through the assembly, secured with a quarter-inch set screw. End bearings including Ventlock number 609 and number 607 support the rod for insulated duct applications, alongside gaskets and a Ventlock number 638 indicating handle or number 635 regulator for uninsulated ducts.
PLAN 3/8 " SQUARE ROD A VENTLOCK NO. 607 ENDBEARING FOR INSULATED DUCT INDICATING HANDLE VENTLOCK NO. 638 REGULATOR NO.635 FOR UNINSULATED DUCT. VENTLOCK NO. 609 END BEARING GASKET (TYP. 2) 1" X 1/8" GALVANIZED STRAPS SPOTWELD TO BLADE 1/4 " SET SCREW 3/8 " SQUARE ROD 16 GAUGE GALVANIZED BLADE A 1/4" LESS THAN THE DUCT DIAMETER
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