Mechanical · M-HTGCC

Duct Hangers Detail

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Multiple hanger configurations for round and rectangular HVAC ducts use standard support hardware per SMACNA guidelines. Round ducts thirty-five inches in diameter and smaller utilize a minimum twenty-two gauge continuous collar drawn tight around the duct, secured with two number ten sheet metal screws and suspended by a three-eighths-inch diameter threaded rod. Larger round ducts thirty-six inches and above employ a one and one-eighth-inch by twelve-gauge split ring collar with a nut and locknut on a three-eighths-inch diameter rod. Rectangular ducts under sixty inches maximum width are supported by a minimum one-inch by twenty-two-gauge hanger strap secured with number ten sheet metal screws. Larger rectangular ducts sixty-one inches and over require a one-inch by eighteen-gauge strap over the duct combined with bottom support using two-inch by two-inch by one-eighth-inch angles or a twelve-gauge strut, suspended on three-eighths-inch diameter rods. Sway and seismic bracing must be provided per SMACNA seismic guidelines, with flexible duct supports spaced at a maximum of four feet with a maximum permissible sag of one-half inch per foot.

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