Mechanical · M-2875A

Supply Air Ductwork Connection

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Various supply air ductwork connections comprise rectangular branch takeoffs, round branch connections, and volume dampers. A main rectangular duct splits using a radius transition elbow and duct transition, with mathematical formulas provided for sizing dimensions A and B. Branch connections utilize a forty-five degree shoe tap connection with a minimum six-inch length or a bellmouth round connection. Volume dampers are specified as single-blade for rectangular ducts twelve inches deep or less and round ducts, and multiple-blade for rectangular ducts greater than twelve inches deep. All ductwork construction conforms to SMACNA duct construction standards.

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