These details illustrate various sheet metal ductwork connections including split mains, square branch takeoffs, square diverging mains, and typical volume dampers. The split main and branch takeoffs incorporate turning vanes with a minimum radius equal to duct width to maintain equal velocities. Square diverging mains feature equal sides and internal vanes to split main branch air flow. Volume dampers utilize opposed acting blades, hinge points, and operating shafts with connecting linkages for quadrant locks.
TRANSITION AS REQ'D. (TYPICAL) R=W MIN. DUCT SPLIT RATIO (SIZE FOR EQUAL VELOCITIES) SPLIT MAIN BRANCH AIR FLOW SQUARE BRANCH TAKEOFF TURN VANES MAIN EQUAL SIDES (TYPICAL) TRANSITION AS REQ'D. (TYPICAL) VANES (TYPICAL) DUCT SPLIT RATIO (SIZE FOR EQUAL VELOCITIES) SQUARE DIVERGING MAIN TYPICAL VOLUME DAMPER HINGE POINT CONNECTING LINKAGE OPERATING SHAFT FOR QUADRANT LOCK OPPOSED ACTING BLADES
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