FIRE-RESISTANCE DESIGN

Assembly Usage Disclaimer

BXUV - Fire Resistance Ratings - ANSI/UL 263 Certified for United States

BXUV7 - Fire Resistance Ratings - CAN/ULC-S101 Certified for Canada

See General Information for Fire-resistance Ratings - ANSI/UL 263 Certified for United States
Design Criteria and Allowable Variances

See General Information for Fire Resistance Ratings - CAN/ULC-S101 Certified for Canada
Design Criteria and Allowable Variances

Design No. G572

March 02, 2018

Restrained Assembly Ratings — 1, 1-1/2, 2 and 3 Hr. (See Items 1, 2, 7B, 8A, 10A - 10Q)

Unrestrained Assembly Ratings — 1, 1-1/2, 2 and 3 Hr. (See Items 1, 2, 7B, 8A, 10A - 10Q)

Unrestrained Beam Ratings — 1, 1-1/2, 2 and 3 Hr. (See Items 1, 2, 7B, 8A, 10A - 10Q)

This design was evaluated using a load design method other than the Limit States Design Method (e.g., Working Stress Design Method). For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7

* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively.

    1. Steel Joists — Composite or noncomposite, spaced 48 in. OC. Min 10 in. deep and min weight of 4.9 lb/ft. Designed per S.J.I. Specifications for a max tensile stress of 30 ksi. May be either uncoated or provided with a shop coat of paint. Top and bottom chords shall each consist of two angles with a min total area of 0.652 and 0.412 sq in., respectively. Web members shall be either round bars or angles. Min area of the end diagonal web shall of 0.277 sq in. Min area of each of the first four interior diagonal webs shall be 0.249 sq in. All other interior webs shall have a min area of 0.196 sq in. For 1 or 2 hour ratings, min. 12 in. deep joists may be spaced up to a max. 72 in. OC.
    1A. Beam — (Not Shown) Min W6 x 9 for 1, 1-1/2 or 2 hr ratings, and min W8 x 24 for 3 hr rating.
    1B. Joist Girders — (Not shown) - As an alternate to Item 1A or 1B, Composite or noncomposite. Min 10 in. deep and min weight of 4.9 lb/ft. Designed per S.J.I. Specifications for a max tensile stress of 30 ksi. May be either uncoated or provided with a shop coat of paint. Top and bottom chords shall each consist of two angles with a min total area of 0.652 and 0.412 sq in., respectively. Web members shall be either round bars or angles. Min area of the end diagonal web shall of 0.277 sq in. Min area of each of the first four interior diagonal webs shall be 0.249 sq in. All other interior webs shall have a min area of 0.196 sq in. Joist Girders spaced up to a max. 72 in. OC.
    2. Normal-Weight or Lightweight Concrete — Min. 2-1/2 in. thick as measured from the top plane of the steel floor and form units. Normal weight concrete, carbonate or siliceous aggregate, 150 plus or minus 3 pcf unit weight, 3500 psi compressive strength. Lightweight concrete, expanded shale, clay or slate aggregate by rotary kiln method, 114 plus or minus 6 pcf unit weight, 3500 psi compressive strength.
    3. Shear Connector — (Optional, Not Shown) — For use with Item 1, 1A or 1B. Shear Studs, min 3/8 in. diam headed type or equivalent per A.I.S.C. specifications. Welded to the top chord of joist through the steel floor units. Stud welding, as recommended by the stud manufacturer, should be followed.
    4. Welded Wire Fabric — Min. 6 x 6 — W1.4 x W1.4, or as required by the latest ACI code.
    4A. Fiber Reinforcement* — As an alternate to Item 4, for 1, 1-1/2 and 2 hr assembly and beam ratings only. Engineered Synthetic or Steel fibers added to concrete mix to control shrinkage cracks in concrete. See Fiber Reinforcement (CBXQ) Category for rate that fibers are added to concrete mix and names of manufacturers. The floor assembly with the fiber reinforcement must still meet its structural capacity requirements.
    5. Steel Floor and Form Units* — Min 9/16 in. deep, min 28 gauge uncoated, painted or galv fluted steel floor units, welded to joist max 15 in. OC.

    CANAM STEEL CORP — 36 in. wide, Type P-3606, P-3615 or P-3623 composite; 24 in. wide Type P-2432 composite: 36 in. wide Type P 3606 or P-3615 non-composite.


    NEW MILLENNIUM BUILDING SYSTEMS L L C — 24 through 36 in. wide, Types 0.6FD, 1.0FD, 1.5FD, 1.5FDR, 1.5FDI, 1.5CDR, 1.5CD, 1.5CDI, 2.0CD, 3.0CD


    6. Tie Wire — No. 18 SWG (0.048 in. diam) galv steel wire. Tie wire used to attach gypsum board furring channels to steel joists, joist girders or cold rolled channels.
    6A. Hanger Wire — (Not Shown) - No. 12 SWG galv steel wire for use where indicated.
    6B. Hanger Clips — (Not Shown) - Galv steel angles, 3/4 in. long with 1-3/8 in. horizontal and 1 in. vertical legs. Vertical leg provided with a 5/16 in. diam hole to accommodate hanger wire. Horizontal leg provided with a 3/16 in. diam hole for insertion of fastener. Hanger clips secured to underside of floor using nom 1-1/8 in. long, 0.145 in. diam shank with 0.312 in. diam head, powder-driven galv steel fasteners.
    7. Furring Channels — Min 0.021 in. thick (25 gauge) galv steel, 7/8 in. high, 2-5/8 in. base width and 1-1/4 in. face width. Installed perpendicular to steel joists 24 in. OC. At gypsum board end joints, one channel shall be located on each side and 3 in. from end joint. All channels tied to bottom chord of each joist with double strand of No. 18 SWG (0.048 in. diam) galv steel wire. At splices, channels overlapped 8 in. and tied together with double strand of tie wire near each end of overlap.
    7A. Cold Rolled Channels — (Not shown) - For use where indicated in Items 10 - 10Q. Min 0.053 in. thick (16 gauge) cold-rolled steel channels, 1-1/2 in. deep with 7/16 in. flanges. When it is necessary to lower the ceiling below the bottom plane of the joists, the cold rolled steel channels shall be used for attachment of furring channels. The channels shall be installed with their web oriented vertically and suspended from the joists or from the hanger clips (Item 6B) with 12 SWG or heavier gauge hanger wire at a max spacing of 48 in. OC. The spacing of the channels shall be no greater than the spacing of the joists. Adjoining lengths of cold-rolled channel spliced together by overlapping min 12 in., face to face or back to back, and tying with three double strands of No. 18 SWG (0.048 in. diam) galv steel wire.
    7B. Cold-Rolled Channels — (Not shown) - Min 0.053 in. thick (16 gauge) cold-rolled steel channels, 1-1/2 in. deep with 7/16 in. flanges. When the composite or noncomposite steel joists are spaced more than 48 in. OC, a cold-rolled steel channel shall be suspended between joists, with its web vertical and with its lower flange flush with the plane at the bottom of the joists, to provide an intermediate support for the furring channels (Item 7). The channel shall be placed so as to provide support for the furring channel such that the span of the furring channel does not exceed 48". The cold-rolled channels are suspended from hanger clips (Item 6B) using 12 SWG galv steel hanger wire spaced max 48 in. OC. The channels shall be installed with their web oriented vertically and suspended from the joists or from the hanger clips (Item 6B) with No. 12 SWG or heavier gauge hanger wire at a max spacing of 48 in. OC. The channels shall be spaced a maximum of 48 in. OC.
    8. Gypsum Board* — 5/8 in. thick, 4 ft wide, installed with long dimension perpendicular to furring channels and with side joints located between joists. End joints in adjacent rows may be staggered or in line. End joints shall be protected with a 3 in. wide backer strip of wallboard to be inserted for entire length of end joint between the two furring channels. The 3 in. wide backer strip is optional for 1 hour restrained and unrestrained assemblies. Gypsum board secured to furring channels with 1-1/4 in. long self-drilling, self-tapping bugle head screws spaced 12 in. OC. Along side joints, screws located 7/8 in. from board edge.

    UNITED STATES GYPSUM CO — Type C


    USG BORAL DRYWALL SFZ LLC — Type C


    8A. Gypsum Board* (As an alternative to Item 8) — Nom 5/8 in. thick, 48 in. wide gypsum board, installed and secured as described in Item 8 with max screw spacing 8 in. OC. Rating limited to 2 hours.

    UNITED STATES GYPSUM CO — ULIX


    9. Joint System — (Not Shown) — Paper tape embedded in joint compound over joints, and covered with two layers of compound with edges feathered out. Gypsum board screw heads covered with two layers of compound.
    10. Air Duct and Damper — (Optional, Not Shown) — Duct made of min 0.024 in. thick (24 gauge) galv steel. Total area of duct openings not to exceed 144 sq in. per 100 sq ft of ceiling area. Area of individual duct opening not to exceed 144 sq in. Max dimension of opening 12 in. Duct supported by 1 1/2 in. deep, min 0.061 in. thick (16 gauge) cold-rolled steel channels spaced not over 48 in. O.C. and on each side of duct opening. Channels suspended from upper chord of joists by 12 SWG galv steel wire. Min clearance of 4 in. required between back of ceiling membrane and bottom of air duct.

    Damper made of min 0.056 in. thick (16 gauge) galv steel protected on both surfaces with 1/16 in. ceramic fiber paper. Located over each duct outlet, attached to bottom of duct with corrosion resistant hinges and held open with a Fusible Link (Bearing the UL Listing Mark). Damper to overlap duct outlet 1 in. min. As an alternate, any UL Classified Ceiling Damper covered for use in 2 Hr or longer rated assemblies. To be installed in duct drop close to the back of ceiling per accompanying installation instructions.

    Ducts containing 5 in. diam or smaller duct drops do not require dampers or other protection at the duct drops. Total area of unprotected duct outlets not to exceed 20 sq. in. per 100 sq ft of ceiling area. Area of individual duct opening not to exceed 20 sq. in.

    10A. Air Duct Materials* — (Optional, Not Shown) - For the 2 h ratings, as an alternate to Air Duct (Item 10), Rigid Air Duct Materials may be used in accordance with their Fabrication Instructions. The duct outlet throat is positioned at the center of 24 in. long min. 0.029 in. thick (22 gauge) galv steel duct liner. These ducts are supported by min. 0.053 in. thick (16 gauge) cold-rolled steel channels suspended from the joists by 12 SWG galv steel wire. Channels are placed directly below the steel duct liner, one on each side of the throat, and otherwise spaced 72 in. OC for ducts up to 36 in. wide, and 48 in. OC for ducts between 36 and 60 in. wide. Additional supporting channels to be installed at a distance ranging from 3 to 6 in. from the ends of each individual duct section. Min. clearance of 4 in. required between back of ceiling membrane and bottom of air duct.

    JOHNS MANVILLE — Rigid, Class I


    KNAUF INSULATION LLC — Rigid, Class I


    OWENS CORNING — Rigid, Class I


    10B. Damper — (Optional, Not Shown) — For use with Item 10A. Min 0.020 in. thick (25 gauge) galv steel. Protected on both surfaces with 1/16 in. ceramic fiber paper and held open with a Fusible Link (bearing the UL Listing Mark). Damper to overlap duct outlet 1 in. min.
    10C. Flexible Air Duct — (Optional, Not Shown) - (Bearing the UL Listing Mark). As an alternate to the 5 in. unprotected duct outlet. Nom 8 in. diam consisting of 0.006 in. thick vinyl coated, glass fiber reinforced fabric over helically wound 0.077 in. diam coated spring steel wire. As an alternate, nom 6 in. diam air duct connector consisting of 0.005 in. thick vinyl coated, glass fiber reinforced fabric over helically wound 0.071 in. diam coated spring steel wire. The flexible air duct and/or duct connector is connected to galv steel sleeve (Item 10D) by means of a stainless steel hose clamp. Flexible air duct or duct connector do not require dampers or other protection at ceiling penetrations.

    The flexible air duct or air duct connector shall be suspended from structural steel or hanger wire anchors by means of a steel strap near the end connected to the steel sleeve (Item 10D), with the remainder of its length placed on the ceiling furring channels or supported approximately 1 in. or higher above the gypsum board with additional steel straps or hanger wires.

    The total area of the flexible air duct opening shall not exceed 50.3 sq in. per each 100 sq ft of ceiling area; max dimension of opening is 8 in. The total area of the air duct connector opening shall not exceed 28.3 sq in. per each 100 sq ft of ceiling area; max dimension of opening is 6 in. Damper is not required when flexible air duct or air duct connector is used.

    As an alternate, the flexible air duct may be supported by the metal hanger straps attached directly to the bottom of the concrete slab with powder-actuated pins. Pins, nom 1 in. long, consisting of 0.145 in. diam smooth-finish galv steel shank with 1/4 in. diam head. Pins tightly inserted in 3/8 in. long gear-shaped plastic washers and driven into the slab through both ends of the strap.

    10D. Duct Outlet Sleeve — (Optional, Not Shown) — For use with Flexible Air Duct or Air Duct Connector (Item 10C) at openings in gypsum board ceiling. 4 in. long sleeve made from 28 gauge galv steel for the 8 in. diam opening and from 30 gauge galv steel for the 6 in. diam opening. The sleeve shall be mounted between two 7/8 in. steel angles of 26 gauge galv steel which are placed on top and overlap the adjacent furring channels approximately 3 in. Each angle is tied to the two furring channels with a double strand of 18 SWG galv steel tie wire through 1/8 in. diam hole drilled in the vertical leg of the steel angles. The sleeve is attached to each of the two angles with one 3/8 in. long Tek sheet steel screw.
    10E. Heating and Air Conditioning Plenum Box Outlet — (Optional, Not Shown) — For the 1-1/2 h ratings, as an alternate to the 5 in. diam unprotected duct outlet. 14 by 14 in. opening penetrating the ceiling. Fabricated from pieces of min 26 MSG galv steel, attached together with lock seams and rivets. Finished box size 16 by 16 by 15 in. outside dimensions. Opposite sides of the box have 10 in. diam openings. The open bottom of the box has 1 in. wide flanges at the four sides to engage into hemmed hanger bars for attaching the box to the furring channels. Hanger bars consist of 1 in. wide plates made from No. 26 gauge galv steel, folded back to form a 5/8 in. return at the top side, for engaging the horizontal flanges at the bottom of the plenum box outlet. The top and the four sides of the box, except for the 10 in. diam openings, shall be lined with 1 in. thick UL Classified fiberglass insulation weighing nom 5 pcf. The 10 in. diam openings on two opposing sides of the box shall be provided with nom 3 in. long collars fabricated from No. 28 gauge galv steel for connecting the box to the nom 10 in. diam flexible air ducts (Item 10F). Box and flexible air duct suspended directly from hanger clips (Item 6B) by hanger wires connected to hanger straps made from 1 in. wide, No. 26 MSG galv steel, spaced max 30 in. OC. As an alternate the strap may be directly attached to the slab by the powder-driven galv steel fasteners described to support the flexible air duct in Item 10C. Top of the box to be min. 5 in. below the bottom plane of the steel floor and form units. Only one 14 by 14 in. outlet is allowed per 100 sq ft of ceiling area.
    10F. Flexible Air Duct — (Optional, Not Shown) — For use with Item 10E. Bearing the UL Listing Mark. 10 in. ID, with a spirally wound steel wire helix (0.045 in. diam wire) covered with vinyl fiber. Core covered with 1 in. thick UL Classified fiberglass insulation weighing 1.0 pcf. Flexible air duct wrapped with outer jacketing consisting of aluminized vinyl film. Flexible air ducts mounted on collars of box (Item 10E), attached to collars with adjustable 10-1/2 in. diam, 9/16 in. wide hose clamp made of 0.024 in. thick stainless steel.
    10G. Heating and Air Conditioning Plenum Box Outlet — (Optional, Not Shown) — For the 2 h ratings, as an alternate to the 5 in. diam unprotected duct outlet. 8 by 10 in. opening penetrating the ceiling. Four sides of box formed from one 5 in. wide strip of No. 28 gauge galv steel, with ends of strip overlapping 3/4 in. and fastened together with two 1/4 in. diam punches. The bottom 1 in. of the strip forming the box sides, bent 90 deg to the outside of the box forming horizontal flanges around the perimeter of the box to engage into hanger bars for supporting the box assembly. Sides of the box lined with 1 in. thick fiberglass insulation weighing nom 5 pcf. Fiberglass lining to be supported on a 1 in. wide steel plate attached at the bottom perimeter of the box's four sides. Top of the box fabricated from No. 28 gauge galv steel with 8 in. diam cutout at the center. Edges of the steel plate forming the top of the box bent down around the box's side perimeter and riveted to the four sides of the box by one rivet at the center of each side. Top of the box, except for the 8 in. cutout, also lined with 1 in. thick UL Classified fiberglass insulation, weighing 5 pcf. Top insulation lining, having 8 in. diam cutout at the center, bears along its perimeter on the 1 in. thick fiberglass lining at the box sides. The 8 in. diam cutout at the top of the box connected to a 4 in. long, 8 in. diam sleeve made from No. 28 gauge galv steel for top mounting of an 8 in. flexible air duct (Item 10H). Flexible air duct suspended by a hanger wire from hanger clip (Item 6B), connected to a nom 1 in. wide, No. 26 MSG galv steel plumbing strap wrapped around the flexible air duct near its connection to the box. As an alternate the strap may be directly attached to the slab by the powder-driven galv steel fasteners described to support the flexible air duct in Item 10C. The remainder of the flexible air duct length placed on the ceiling furring channel or supported min. 1 in. above the gypsum board with additional steel straps or hanger wires.

    Only one 8 by 10 in. box outlet is allowed per 100 sq ft of ceiling area.

    10H. Flexible Air Duct — (Optional, Not Shown) — (Bearing the UL Listing Mark) — For use with Item 10G, nom 8 in. diam, consisting of 0.005 in. thick vinyl-coated reinforced fiberglass fabric, wrapped over helically wound 0.038 in. diam coated spring steel wire. Flexible air duct attached to box sleeve with adjustable 8-1/2 in. diam, 9/16 in. wide hose clamp made from 0.024 in. thick stainless steel.
    10I. Heating and Air Conditioning Plenum Box Outlet — ((Optional, Not Shown) — For the 2 h ratings, as an alternate to the 5 in. diam unprotected duct outlet. 10 by 10 in. opening penetrating the ceiling. Box fabricated from pieces of No. 28 gauge galv sheet steel and riveted together. Finished box size: 12 by 12 by 12 in. One side of the box has 10 in. diam opening. Box top and four sides of the box except the 10 in. cutout for opening, have 1 in. thick of UL Classified fiberglass, 5 pcf. Neck at side opening consisting of 10 in. diam sleeve fabricated from 3-1/2 in. wide strip of No. 28 gauge galv steel. One end of the sleeve notched 1/8 by 3/4 in. at 5/8 in. OC along its perimeter and bent 90 deg against the fiberglass lining around the 10 in. diam opening to secure the sleeve to the box. The sleeve to be connected to a 10 in. diam, UL Listed side-mounted flexible air duct (Item 10J). Flexible air duct suspended by a hanger wire from hanger clip (Item 6B), connected to a nom 1 in. wide, No. 26 MSG galv steel plumbing strap wrapped around the flexible air duct at its connection to the box\'s sleeve. As an alternate the strap may be directly attached to the slab by the powder-driven galv steel fasteners described to support the flexible air duct in Item 10C. The remainder of the flexible air duct length placed on the ceiling furring channel or supported min. 1 in. above the gypsum board with additional steel straps or hanger wires.

    Only one 10 by 10 in. box outlet is allowed per 100 sq ft of ceiling area.

    10J. Flexible Air Duct — (Optional, Not Shown) — (Bearing the UL Listing Mark) For use with Item 10I. Nom 10 in. diam consisting of 0.002 in. thick vinyl-coated reinforced fiberglass fabric, wrapped over helically wound 0.051 in. diam, coated spring steel wire. Flexible air duct attached to box sleeve with adjustable 10-1/2 in. diam, 9/16 in. wide hose clamp made from 0.024 in. thick stainless steel.
    10K. Fixtures, Recessed Light — (Optional, Not Shown) — (Bearing the UL Listing Mark) — For the 1-1/2 h ratings , as an alternate to the 5 in. diam unprotected duct outlet. A max of four fixtures per 100 sq ft of ceiling area. Fixture housing 6-1/2 in. diam, 7-1/2 in. high, made from painted or galv steel. Each fixture supported on a base 6-1/2 in. by 9-7/8 in., made from painted or galv steel and screw-attached to the fixture by four screws. Each fixture with trim and lens weighs 4 lb max. Short sides of the base containing tabs for engagement into adjustable hanger bars supporting the fixture. Each fixture hanger bar screw-attached at one end to the ceiling furring channel and at the other end to additional furring channel parallel to and at 9 in. from the ceiling furring channel. Fixture trim 8 in. OD with a 5-1/4 in. inside diam opening to support a 5-3/8 in. diam diffused glass lens. Each fixture may be activated with nom 1 in. diam UL Listed electrical nonmetallic tubing wired with three No. 12 AWG Type THWN copper conductor wires or a UL Listed nonmetallic sheathed cable with three No. 12 AWG Type THWN copper conductor wires.
    10L. Fixture, Recessed Light — (Optional, Not Shown) — (Bearing the UL Listing Mark) — For the 2 h ratings, as an alternate to the 5 in. diam unprotected duct outlet. Fluorescent lighting fixture with 12 by 12 by 5-1/2 in. aluminum housing, lampholder, ballast for fluorescent lamp and nom 2-1/2 by 4 by 2-1/4 in. deep galv steel junction box attached to one side of the light housing. Penetration of light into the ceiling is 7-3/4 in. diam max. Light fixture weighs 8 lbs max. Hanger tabs of light fixture wire-tied to nom 27 in. long cold-rolled steel channels on both sides of fixture. Ends of cold-rolled channels supporting the fixture wire-tied to top surface of two consecutive ceiling furring channels using No. 18 SWG galv steel tie wire. Light fixture may be activated with a 3/4 in diam electrical nonmetallic tubing (ENMT) containing three No. 12 or No. 14 AWG Type THHN wire; or nonmetallic sheathed cable with two conductors with grounding, or 1/2 in. diam flexible metal conduit containing three No. 12 AWG Type THHN wires. Only one fixture is allowed per 100 sq ft of ceiling area.
    10M. Exhaust Fan — (Optional, Not Shown) — (Bearing the UL Listing Mark) — For use with Item 10O for the 2 h ratings, as an alternate to the 5 in. diam unprotected duct outlet. Frame made of painted steel measuring 7-1/2 by 7-1/8 by 3-5/8 in. Fan gross weight 3.75 lb max. The ceiling penetration from the exhaust fan shall not exceed 7-1/2 by 7-1/8 in. The installation of the exhaust fan requires an additional furring channel parallel to the ceiling channel and tied to two consecutive cold rolled channels or joists bottom chord. Fan screw-attached from one side to the ceiling furring channel and from the other side to the additional furring channel with two screws at each side through holes predrilled in the fan housing. Fan wired with a UL Listed nonmetallic sheathed cable with three No. 12 AWG conductors. Fan includes a 3 in. diam exhaust steel duct fastened to the outlet with aluminum foil tape.

    Only one exhaust fan penetration and one ceiling runner penetration are allowed per 100 sq ft of ceiling area.

    10N. Electrical Junction Box — (Optional, Not Shown) — Bearing the UL Listing Mark. Max 4 in. diam steel junction box with cover plate flush with ceiling. Attached with two 3/8 in. long steel screws to a section of steel furring channel placed on top and perpendicular to ceiling furring channels (Item 7), with its ends extending about 5 in. beyond the adjacent ceiling furring channels. Electrical cable to be supported from the steel joists, cold-rolled channels (Item 7A) or hanger clips (Item 6B).

    For the 2 h ratings, only one junction box is allowed per 100 sq ft of ceiling area in addition to the 5 in. diam unprotected duct outlet.

    For the 3 h ratings, only one junction box is allowed per 100 sq ft of ceiling area as an alternate to the 5 in. diam unprotected duct outlet.

    10O. Ceiling Runner Penetration — (Optional, Not Shown) — Framing consisting of either nominal 4 or 6 in. wide steel C-channels with 2 in. flanges; or nominal 2x4 or 2x6 plates of structural grade lumber runner into stud cavity of steel or structural grade lumber stud sheathed with generic unclassified gypsum board partition (Not Shown). Bottom runner suspended by hanger wires tied to a cold rolled channel (Item 7A) running parallel to the runner. Hanger wires used for supporting the bottom runner and penetrating the top runner shall be spaced a max 12 in. OC. Top runner placed directly above, and screw-attached to web of 24 in. long pieces of furring channel, spaced at 16 in. OC. One in. long pieces of the supporting channel's web removed at both ends with the steel surfaces on both flanges bent 90 deg, for screw-attaching the supporting channels to the main ceiling furring channels. The top cold rolled channel supporting the suspended boxed partition shall be directly suspended from hanger clips, Item 6B. Bottom of partition protected with two layers of gypsum board (Item 8) as shown.

    For the 2 h ratings, only one ceiling runner penetration together with one exhaust fan. (Item 10M) are allowed per 100 sq ft of ceiling area as an alternate to the 5 in. diam unprotected duct outlet.

    For the 1 h ratings, only one ceiling runner penetration together with Nonmetallic Pipes (Item 10P) are allowed per 100 sq ft of ceiling area as an alternate to the 5 in. diam unprotected duct outlet.

    10P. Nonmetallic Pipes — (Optional, Not Shown) — For the 1 h floor-ceiling ratings, as an alternate to the 5 in. diam unprotected duct outlet. Nom 2 in. and 4 in. diam Schedule 40 PVC (polyvinyl chloride) or CPVC (chlorinated polyvinyl chloride) supply or drain, waste and vent piping system. PVC or CPVC pipes penetrate the ceiling runner into stud cavity of steel or structural grade lumber stud sheathed with generic unclassified gypsum wallboard partition (Item 10O). The PVC or CPVC pipes are supported by hanger straps in conjunction with steel hanger wires suspended from hanger clips, Item 6B. As an alternate the strap may be directly attached to the slab by the powder-driven galv steel fasteners described to support the flexible air duct in Item 10C. The spacing of hanger straps supporting the pipes shall not exceed 25 in. OC. Only one nom 4 in. diam PVC or CPVC pipe and one nom 2 in. diam PVC or CPVC pipe are allowed per 100 sq ft of ceiling area. Min clearance of 4 in. required between back of ceiling membrane and bottom of nonmetallic pipes.
    10Q. Alternate Penetrating Items — (Optional, Not Shown) — One or all of the following may be used in conjunction with 10P: ENMT (Non-metallic tubing), Romex Cable, and an additional bundle of tubing including 2 copper tubes (7/8 in. diam), non-metallic pipe (1 in. diam schedule 40 PVC), and non-metallic wire (low voltage). These items are located within the stud cavity of a rated or non-rated gypsum board partition.

    * Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively.

Last Updated on 2018-03-02
BXUV.G572 G572 BXUV 211701001 DESIGN Active 20180302 20180302 211701001 132101001 730408054 P1802957 730408054 880051001 105439005 334053001

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