Mechanical · M-4H96W

Round and Rectangular Duct Hangers

Materials

Steel Metal (misc.)

Elements

Bracing

Connections

Bolted Connection

About this detail

These HVAC duct hanger details illustrate suspension methods for round and rectangular ducts using overhead attachments. Smaller ducts twenty-five inches and smaller utilize a one inch by twenty-two gauge minimum continuous collar drawn tight around the duct, secured with two number ten by five-eighths inch sheet metal screws and suspended by a one inch by twenty-two gauge minimum hanger strap. Larger ducts twenty-five inches and larger utilize either a three-eighth inch diameter rod or a one inch by sixteen gauge hanger strap attached to a one and one-half inch by twelve gauge split ring collar around the duct, fastened with a one-quarter inch bolt, nut, and star washer, and secured with a typical nut and locknut. Hanger spacing and sway and seismic bracing must comply with the SMACNA seismic restraint manual second edition. Attachments to overhead structure are made in accordance with structural engineer requirements and weight limitations.

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