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Title: Section 711  •  Size: 9444

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SECTION 711 - SHAFT ENCLOSURES

711.1 General. Openings through floors shall be enclosed in a shaft enclosure of fire-resistive construction having the time period set forth in Table 6-A for "shaft enclosures" except as permitted in Sections 711.3, 711.5 and 711.6. See also Section 304.6 for shafts in Group B Occupancies, Sections 306 and 307.11.2.3 for shafts in Group H Occupancies and Section 309.8 for shafts in Group R Occupancies.

711.2 Extent of Enclosures. Shaft enclosures shall extend from the lowest floor opening through successive floor openings and shall be enclosed at the top and bottom.

EXCEPTIONS: 1. Shafts extending through or to the underside of the roof sheathing, deck or slab need not be enclosed at the top.

2. Noncombustible ducts, vents or chimneys used to convey vapors, dusts or combustion products may penetrate the enclosure at the bottom.

3. Shafts need not be enclosed at the bottom when protected by fire dampers conforming to approved recognized standards, installed at the lowest floor level within the shaft enclosure.

Shaft enclosures shall be constructed to continuously maintain the required fire-resistive integrity.

711.3 Special Provision. In other than Group I Occupancies, openings which penetrate only one floor and are not connected with openings communicating with other stories or basements and which are not concealed within building construction assemblies need not be enclosed.

Exit enclosures shall conform to the applicable provisions of Section 1009.

In one- and two-story buildings other than Group I Occupancies, gas vents, ducts, piping and factory-built chimneys which extend through not more than two floors need not be enclosed, provided the openings around the penetrations are fire stopped at each floor.

EXCEPTION: BW gas vents installed in accordance with their listing.

Gas vents and factory-built chimneys shall be protected as required by the Mechanical Code.

Walls containing gas vents or noncombustible piping which pass through three floors or less need not provide the fire-resistance rating specified in Table 6-A for "shaft enclosures," provided the annular space around the vents or piping is filled at each floor or ceiling with noncombustible materials.

EXCEPTION: BW gas vents installed in accordance with their listing.

Openings made through a floor for penetrations such as cables, cable trays, conduit, pipes or tubing which are protected with approved through-penetration fire stops to provide the same degree of fire resistance as the floor construction need not be enclosed. For floor-ceiling assemblies, see Section 710.

711.4 Protection of Openings. Openings into a shaft enclosure shall be protected by a self-closing or an automatic-closing fire assembly conforming to Section 713 and having a fire-protection rating of one hour for openings through one-hour fire-resistive walls and one and one-half hours for openings through two-hour fire-resistive walls.

EXCEPTIONS: 1. Openings to the exterior may be unprotected when permitted by Table 5-A.

2. Openings protected by through-penetration fire stops to provide the same degree of fire resistance as the shaft enclosure. See Sections 709 and 710.

Openings in shaft enclosures penetrating smoke barriers shall be further protected by smoke dampers conforming with approved recognized standards. See Chapter 35, Part III.

EXCEPTIONS: 1. Exhaust-only openings serving continuously operating fans and protected using the provisions of Chapter 9.

2. Smoke dampers are not required when their operation would interfere with the function of a smoke-control system.

711.5 Rubbish and Linen Chute Termination Rooms. In other than Group R, Division 3 Occupancies, rubbish and linen chutes shall terminate in rooms separated from the remainder of the building by an occupancy separation having the same fire resistance as required for the shaft enclosure, but not less than one hour. Openings into chutes and chute termination rooms shall not be located in exit corridors or stairways. For sprinklers, see Section 904.2.2.

711.6 Chute and Dumbwaiter Shafts. In buildings of Type V construction, chutes and dumbwaiter shafts with a cross-sectional area of not more than 9 square feet (0.84 m²) may be either of approved fire-resistive wall construction or may have the inside layers of the approved fire-resistive assembly replaced by a lining of not less than 0.019-inch (0.48 mm) No. 26 galvanized sheet gage metal with all joints locklapped. The outside layers of the wall shall be as required for the approved construction. All openings into any such enclosure shall be protected by not less than a self-closing solid-wood door 13/8 inches (35 mm) thick or equivalent.

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