HVAC duct takeoff connecting a branch duct to a main supply duct using either a 45-degree branch fitting or a round spin-in tap. A balancing damper with a locking quadrant is installed in the branch duct. A note specifies using a 45-degree branch fitting when the main supply duct depth is equal to or smaller than the takeoff round duct size. Sizing dimensions for the branch fitting and round duct are referenced in an accompanying schedule table.
AIR FLOW MAIN DUCT 60* 45* A" x B" C" 10 12 14 16 12x8 12x10 16x10 22x10 BRANCH DUCT, SEE PLANS FOR SIZE. BALANCING DAMPER WITH LOCKING QUADRANT MIN. 5" W/4 MAIN DUCT W 60* A" x B" C" ROUND SPIN-IN TAP WITH MANUAL VOLUME DAMPER (TYPICAL) 45* AIR FLOW TAKE-OFF ROUND DUCT NOTE: USE 45* BRANCH FITTING WHEN MAIN SUPPLY DUCT DEPTH IS EQUAL TO OR SMALLER THAN TAKE-OFF ROUND DUCT SIZE.
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