Mechanical · M-JH3Q5

Exhaust Duct Subduct Isometric and Riser Section Detail

Materials

Steel

Elements

Stairs Connections / Plates

Connections

Welded Connection

About this detail

Stainless steel or galvanized steel subduct and forty-five degree tee flanges connect to the riser panel air tight, fastened with spot welds or stainless steel screws spaced on four-inch centers and sealed airtight for galvanized steel ducts. The subduct matches the material and gauge of the riser, with a hem formed on the top of the subduct on three sides where the length is twenty-four inches and over. The vertical offset Y varies based on the branch duct width W: four inches when W is less than eleven inches, six inches when W is between eleven and sixteen inches, and eight inches when W is greater than sixteen inches. The subduct width equals the branch duct width plus two inches, and the subduct length equals the branch duct length plus two inches, incorporating a forty-five degree slope.

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