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XHEZ.W-J-7104
Through-penetration Firestop Systems

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Through-penetration Firestop Systems


See General Information for Through-penetration Firestop Systems

System No. W-J-7104

July 24, 2009

F Rating — 2 Hr

T Rating — 2 Hr

    1. Wall Assembly — Min 6 in. (152 mm) thick reinforced lightweight or normal weight (100-150 pcf or 1600-2400 kg/m3) concrete. Wall may also be constructed of any UL Classified Concrete Blocks*. Max size of opening is 17.3 sq ft (1.61 m2) with a max width of 89 in. (2.26 m).

      See Concrete Blocks (CAZT) category in Fire Resistance Directory for names of manufacturers.

    2. Steel Air Duct — Max 85 by 24 in. (2160 by 610 mm) by 0.030 in. ( 0.76 mm) thick (22 GA) galvanized steel duct to be installed either concentrically or eccentrically within the opening. The annular space shall be min 1 in. (25 mm) to max 3 in. (76 mm) within the framed opening. The duct shall be constructed and reinforced in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible. Steel duct to be rigidly supported on both sides of wall assembly.
    3. Duct Wrap Materials* — Nom 1-1/2 in. (38 mm) thick ceramic fiber batt or blanket (min 6 pcf or 96 kg/m3) jacketed on the outside with a foil-scrim-poly facing, installed in a telescope, checkerboard or butt-joint-and-collar pattern with 3 in. (76 mm) transverse and longitudinal overlaps, in accordance with the requirements of Ventilation Assembly No. V-27. See Ventilation Duct Assemblies in Vol. 2 of the UL Fire Resistance Directory. Longitudinal and transverse joints sealed with aluminum foil tape.

    3M COMPANY

    3M FIRE PROTECTION PRODUCTS — 3M FireBarrier Duct Wrap 615 or 3M FireBarrier Duct Wrap 615+


    4. Firestop System — The firestop system shall consist of the following:
      A. Packing Material — Min 4-3/4 (121 mm) thickness of min 6 pcf (96 kg/m3) duct insulation firmly packed into opening as a permanent form. Packing material to be recessed from both surfaces of wall as required to accommodate the required thickness of fill material.

      3M COMPANY

      3M FIRE PROTECTION PRODUCTS — 3M FireBarrier Duct Wrap 615 or 3M FireBarrier Duct Wrap 615+


      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.

      3M COMPANY

      3M FIRE PROTECTION PRODUCTS — 3M FB-1000 NS


      C. Steel Retaining Angles — Stiffening angle 1-1/2 by 2 by 1/8 in. (38 by 52 by 3.2 mm), applied around the perimeter of the duct with the 2 in. (52 mm) leg against the sealant (Item 4B above). Angles attached to steel duct on both sides of wall with min No. 10 steel sheet metal screws spaced a max of 1 in. (25 mm) from each end of steel duct and spaced a max of 6 in. (152 mm) OC.

    *Bearing the UL Classification Mark

Last Updated on 2009-07-24

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