Mechanical · M-32C3N

VAV Terminal Unit Installation and Support Detail

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An isometric diagram details the proper installation, hanging methods, and clearance requirements for a variable air volume terminal unit. Main supply airflow enters through insulated medium velocity ductwork with a high-efficiency take-off and a minimum straight length of four duct diameters. Downstream discharge utilizes insulated low velocity metal ductwork. Lighter VAV boxes rated at 1,400 CFM or less are supported by 1-1/2-inch galvanized straps at all four corners, while larger units exceeding 1,400 CFM require trapeze supports made from reinforcing angles and 3/8-inch galvanized all-thread rod hangers. A minimum 24-inch clearance is maintained on the control side, increased to 42-inch clearance where electric reheat voltage exceeds 150 volts per National Electrical Code requirements.

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