Architectural · A-3X4NC

Two-Hour Fire-Rated Horizontal Assembly at Duct Chase

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This two-hour fire-rated horizontal shaft wall assembly accommodates mechanical ducts, bus ducts, or fuel oil lines. The construction utilizes 4-inch or 2.5-inch CH-34 steel studs spaced at 24 inches on center with 1-inch gypsum shaft liner panels and sound attenuation blankets. Steel J-runners anchor the assembly, fastened at a maximum of 24 inches on center. The ceiling side features three layers of 5/8-inch Type C gypsum panels with continuous sealant at the wall junction, while the chase wall features two layers of 5/8-inch Type C gypsum panels. USG C-H studs are not designed to carry live loads or equipment, and spans greater than 5 feet 4 inches require UL Design K504 and K506.

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