A branch duct connects to the main duct using a forty-five degree entry configured per SMACNA standards. High velocity duct systems require the entry opening to be limited to a maximum of one thousand five hundred feet per minute to avoid noise generation. A minimum six inch clearance is maintained.
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
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