Branch duct takeoffs connect flexible or rigid round run-outs and supply registers to main supply ducts with volume dampers and square-to-round high-efficiency fittings. Branch duct connections feature volume dampers and are limited to branches carrying forty percent or less of the main duct cubic feet per minute. Air split-type duct takeoffs incorporate internal turning vanes and proportional split dimensions, allowing for either square or round elbows. Volume dampers are provided within the run-outs when indicated on the mechanical plans.
MAIN SUPPLY DUCT SQUARE TO ROUND HIGH EFFICIENCY TAKEOFF WITH VOLUME DAMPER FLEXIBLE OR RIGID ROUND RUN OUT, SEE PLANS SUPPLY REGISTER OR GRILLE SUPPLY REGISTER & RUN OUT TAKEOFF BRANCH DUCT TAKEOFF AIR SPLIT TYPE DUCT TAKEOFF SUPPLY DUCT TAKEOFFS MAIN SUPPLY DUCT VOLUME DAMPER BRANCH DUCT USE THIS IF BRANCH CFM IS 40% OR LESS OF MAIN DUCT CFM SPLIT DIM PROPORTIONATE TO CFM SPLIT PROVIDE VOLUME DAMPER WHEN SHOWN ON PLANS SQUARE ELBOW SHOWN. ROUND ELBOW IS ACCEPTABLE PROVIDE VOLUME DAMPER WHEN SHOWN ON PLANS MAIN SUPPLY DUCT TURNING VANES SUPPLY REGISTER OR BRANCH DUCT USE THIS IF BRANCH CFM IS 40% OR LESS OF MAIN DUCT CFM W 4" MIN 1/4 W 4" MIN 1/4 W 4" MIN 1/4 W W
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