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System No. W-L-7156 <br />3. Batts and Blankets* — Nom 1-1/2 or 2 in. (38 or 51 mm) thick glass fiber batt or blanket (min 3/4 pcf or 12 kglm3) jacketed on the outside with a <br />foil-scrim-kraft facing. Longitudinal and transverse joints sealed with aluminum foil tape. During the installation of the fill material, the batt or <br />blanket shall be compressed minimum 50% such that the annular space within the Firestop system shall be min 1/2 in. (13 mm) to max 3-1/2 in. <br />(89 mm); refer to the table below. <br />See Batts and Blankets (BKNV) category in the Building Materials Directory for names of manufacturers. Any batt or blanket meeting the above <br />specifications and bearing the UL Classification Marking with a Flame Spread Index of 25 or less and a Smoke Developed Index 50 or less <br />may be used. <br />4. Firestop System — The firestop system shall consist of the following: <br />A. Packing Material — Min f 5m8 (91 or 2 hr fire/ ain. (124s, respectivelmm) thickn y. Packing material alk of be recessed from both surfaces of m3) mineral wool batt insulation lall to packed into <br />opening as a permanent <br />accommodate the required thickness of fill material. <br />B. Fill, Void or Cavity Material* — Sealant — Min 5/8 in. (16 mm) thickness of fill material applied within annulus, flush with both surfaces of wall. <br />HILTI CONSTRUCTION CHEMICALS, DIV OF HILTI INC — FS-ONE MAX Intumescent Sealant <br />C. Steel Retaining Angles — Min No.16 gauge (0.059 in. or 1.5 mm) galv steel angles sized to lap steel duct a min of 2 in. 51 mm) and lap wall <br />surfaces a min of 1 in. (25 mm). Angles attached to steel duct on both sides of wall with min No.10 steel sheet metal screws spaced a max of <br />1 in. (25 mm) from each end of steel duct and spaced a max of 6 in. (152 mm) OC. When max duct dimension does not exceed 48 in. (122 <br />cm) and duct area does not exceed 1300 in2 (8387 cm2), angles may be min No.18 gauge gals steel. Angles attached to steel duct on both <br />sides of wall with min No.10 by 112 in. (13 mm) long steel sheet metal screws located a max of 1 in. (25 mm) from each end of steel duct and <br />spaced a max of 6 in. (152 mm) OC. In addition, see table below for additional conditions and options regarding retaining angles. <br />Max <br />Packing <br />Angle (Item <br />Max Duct <br />Duct <br />Insulation <br />Annular <br />Material <br />4C) <br />T-Rating Hr <br />Dimension <br />Thickness <br />Thickness <br />Space <br />(Item 4A) <br />Required <br />Required <br />(Item 3) <br />**24 in. (610 <br />24 ga or <br />in. 38 <br />1-1/2 ( <br />114 in. min to <br />1 in, max (6 <br />No <br />No <br />0 <br />mm) <br />heavier <br />mm) <br />to 25 mm) <br />25 in. (635 <br />114 in. min to <br />1 and 2 <br />mm) wide by <br />24 ga or <br />2 in. (51 <br />3-1/2 in. <br />Yes <br />No <br />(Same as <br />45 in. (1143 <br />heavier <br />mm) <br />max (6 to 89 <br />wall rating) <br />mm) high <br />mm) <br />** Indicates that when max 1-1/2 in. (38 mm) thick insulation is used, steel angles are optional for those sides of the duct that do not exceed the <br />dimension specified. <br />* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), <br />respectively. <br />Reproduced by HILTI, Inc. Courtesy of <br />Underwriters Laboratories, Inc. <br />August 22, 2018 <br />HIM Firestop Systems <br />Page: 2 of 2 <br />