Branch duct connections to main ducts utilize saddle taps, spin-in fittings, or forty-five-degree entry angles with a manual volume damper installed on the fitting. Round branch flex or spiral ducts connect directly into the main duct system with specified transition geometries. Duct crossovers beneath structural beams maintain a maximum three-foot dimension with specified clearance heights equal to at least half the duct dimension.
3'-0" MAX THIS DIMENSION MUST BE AT LEAST 1/2 "D" "D" 30° OR LESS (TYPICAL) DUCT UNDER BEAM OR CROSSOVER SECTION NO SCALE BRANCH DUCT 45° MAIN "D" 4 "D" BRANCH FLEX OR SPIRAL DUCT MANUAL VOLUME DAMPER ON FITTING (TYPICAL) 45° MAIN ROUND BRANCH DUCT NO SCALE ROUND BRANCH FLEX DUCT OR SPIRAL DUCT MANUAL VOLUME DAMPER (RECTANGULAR) MAIN DUCT SADDLE TAP OR SPIN-IN FITTING 45°
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