Low pressure balancing dampers feature twenty gauge blades with edges hemmed one-half inch and a maximum blade height of twelve inches. A three-eighths inch square rod with washers at each end operates through bearings provided at both ends. Single blade units serve ducts up to twelve inches high and less than twenty-nine inches wide, while multiple blades serve larger ducts using an opposed action linkage assembly. A twenty gauge offset quadrant mounting bracket on insulated duct only includes a locking type indicator quadrant with one damper regulator for each two blades. Damper supports are riveted to the duct.
SUPPORTS RIVETED TO DUCT (TYP.) END 4"X 4"X 20 GAUGE 20 GAUGE DAMPERS - EDGES BLADE HEIGHT 12" (TYP.). HEMMED 1/2" AS SHOWN, MAX. PROVIDE FOR EACH DAMPER REGULATOR FOR EACH TWO BLADES. 20 GAUGE OFFSET QUADRANT INSULATED DUCT ONLY. TYPE INDICATOR QUADRANT ONE DAMPER REGULATOR WITH LOCKING MOUNTING BRACKET ON DUCT (TYP.) 1. USE SINGLE BLADE FOR DUCTS UP TO 12" HIGH DAMPER ROD CLIP (TYP.) THAN OR EQUAL TO 29" AND/OR OVER 12" HIGH. 2. USE MULTIPLE BLADES FOR DUCTS GREATER LINKAGE ASSEMBLY. OPPOSED ACTION AND LESS THAN 29" WIDE. NOTES: ROD ROUND (TYP.). BOTH ENDS AND GRIND 3/8" SQUARE ROD WITH WASHER AT EACH END PROVIDE BEARINGS AT (TYP.)
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