Mechanical · M-E3W24

VAV Box Installation and Hanger Detail

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A single duct VAV box is suspended from the overhead structure using three-eighths-inch all-thread rods attached to unit-mounted hanging brackets. Each hanging bracket is secured with a neoprene gasket, nuts, and a washer. The primary air inlet connects to a medium-pressure supply duct, which requires three straight diameters downstream of an elbow where space allows. A minimum of forty-eight inches of straight, unlined duct must be maintained off the unit discharge prior to any elbows, turns, or air takeoffs. The assembly incorporates a reheating coil, a DDC controller, an actuator, and reheat control with a minimum forty-eight-inch clearance. Clearances of forty-two inches for two-hundred-seventy-seven-volt systems and forty-eight inches for four-hundred-eighty-volt systems must be maintained in front of the unit.

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