Mechanical · M-RY86K

Mechanical Duct Wall Support Details

Materials

Concrete Cold-formed Steel Timber / Wood Masonry / CMU Brick Metal (misc.)

Elements

Walls Anchors / Embeds

Connections

Welded Connection Bolted Connection Embed Plate

About this detail

HVAC ductwork is supported against or near building walls using sizing tables and bracket assemblies for varying duct dimensions and gauges. Fig. A addresses smaller ducts from 18"x12" to 24"x20" using 1-1/2"x16 gauge bands or 1"x1/8" straps. Fig. B covers larger ducts from 30"x12" to 48"x30" using angle iron bands ranging from 1"x1"x1/8" up to 1-1/4"x1"x1/8" with 45-degree corner braces. Wall anchorage consists of either 1/2" diameter Hilti KB3 expansion anchors with 3-1/2" embedment at concrete masonry unit walls, 1/2" bolts into backing at metal stud walls, or 3/4" diameter epoxy anchors with 7-1/2" embedment at fully grouted brick masonry walls. Brackets are engineered for a maximum duct length of 12 feet, requiring tensile and shear load design checks with a safety factor of 4.

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