Mechanical · M-8235S

Duct Hangers Detail

Materials

Elements

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Round and rectangular HVAC duct hanger assemblies are suspended using three-eighths-inch diameter steel rods, sheet metal screws, and SMACNA-compliant support straps. Round ducts utilize one-and-one-eighth-inch by twelve-gauge split ring collars or continuous collars drawn tight around the duct and secured with nuts and locknuts. Rectangular ducts utilize minimum twenty-two-gauge hanger straps, two-by-two-by-one-eighth-inch top and bottom angles, or twelve-gauge strut channels depending on duct dimensions and seismic location requirements.

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