A branch duct connects to a main duct with a forty-five degree entry configured per SMACNA standards. A volume damper is installed within the branch duct downstream of the connection. For high velocity duct systems, the entry opening requires a note specifying a maximum velocity of 1500 FPM to prevent noise generation. A minimum six inch clearance is maintained from the takeoff.
NOTE: 6" MIN WHEN USING THIS TAKE-OFF FOR HIGH VELOCITY DUCT SYSTEMS THE ENTRY OPENING SHOULD BE NOTED: "NOT TO EXCEED 1500 FPM" TO AVOID NOISE GENERATION. BRANCH DUCT 45° ENTRY PER SMACNA MAIN DUCT VOLUME DAMPER
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