A branch duct connects to a main duct using a forty-five degree entry configured per SMACNA standards. The entry opening requires a minimum six-inch dimension and must not exceed one thousand five hundred feet per minute on high-velocity duct systems to avoid noise generation.
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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