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Fire Protection of Horizontal Venting <br /> Page 2 of 2 <br /> Protected Fan in Joist Space <br /> (Sprinklered Buildings Only) 5/8"type X gypsum wall board fire-taped <br /> protective box must be mechanically secured with <br /> strapping at corners to strengthen the box. The <br /> number of layers of gypsum board to match the <br /> number of layers required for the rated ceiling <br /> assembly. <br /> FAN C <br /> 1# 1IEII ' °>_ it*iI <br /> 1-hour through penetration fire stop installed per <br /> approved manufacturer's requirements. <br /> Metal ductwork <br /> Plastic piping material (maximum 100 sq. in. in <br /> area) may penetrate box. Extend no more than 6" <br /> outside box, and connect to the fire stop. <br /> Ci 1�yGov net <br /> 1 <br />