Fire Protection · G-J98FY

UL Firestop System at Gypsum Board Wall Penetration

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Underwriters Laboratories System No. W-L-2538 provides one- and two-hour fire ratings for electrical nonmetallic tubing penetrating a gypsum board and steel or wood stud wall assembly. The wall assembly consists of either nominal two by four inch wood studs spaced a maximum of sixteen inches on center or minimum three-and-one-half-inch steel channel studs spaced a maximum of twenty-four inches on center, faced with nominal five-eighths-inch thick gypsum board. Openings in the gypsum board measure two-and-one-half inches in diameter for a nominal two-inch firestop device and four-and-one-half inches in diameter for a nominal four-inch device. The through penetrant is a nominal two-inch diameter or smaller electrical nonmetallic tubing formed from polyvinyl chloride and installed per the National Electrical Code. Tubing is rigidly supported on both sides of the wall.

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