This structural steel detail shows a rectangular web opening in a wide flange beam designed to accommodate mechanical ductwork. The clear opening dimensions equal the duct size plus an added clearance, with one inch minimum rounded corners specified at the opening edges. Web reinforcing plates match the beam flange thickness and width, extending the full length along the top and bottom with five-sixteenth inch fillet welds. One-half inch stiffener plates are welded to each side of the vertical opening boundaries using five-sixteenth inch welds at six-to-twelve spacing, complemented by three-sixteenth inch fillet welds typically applied at the top and bottom.
A A W / 2 W W / 2 DUCT SIZE + (__") CLEAR OPENING DUCT SIZE + (__") CLEAR OPENING EQ EQ HOLE PROVIDE 1" MIN ROUNDED CORNERS WEB REINF PL TO MATCH BM FLANGE THICKNESS AND WIDTH OPEN 1/2" STIFF PL EA SIDE 3/16 3/16 TYP TOP AND BOTT 5/16 5/16 6-12 6-12 5/16 5/16 FULL LENGTH OF EXTENSION, TYP
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