Div. B › Part 9 › 9.10 › 9.10.17 — Flame Spread Limits

9.10.17.4 — Exterior Exit Passageways

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(1) Where an exterior exit passageway provides the only means of egress from the rooms or suites it serves, the wall and ceiling finishes of that passageway, including the soffit beneath and the guard on the passageway, shall have a surface flame-spread rating of not more than 25, except that up to 10% of the total wall area and 10% of the total ceiling area is permitted to have a surface flame-spread rating of not more than 150.

OBC Definitions

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exit

means that part of a means of egress, including doorways, that leads from the floor area it serves to a separate building, an open public thoroughfare or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare.

flame-spread rating

means an index or classification indicating the extent of the spread of flame on the surface of a material or an assembly of materials, as determined in a standard fire test prescribed in this Code.

guard

means a protective barrier, with or without openings through it, that is around openings in floors or at the open sides of stairs, landings, balconies, mezzanines, galleries, raised walkways or other locations to prevent accidental falls from one level to another.

means of egress

means of egress includes exits and access to exits and means a continuous path of travel provided for the escape of persons from any point in a building or in a contained open space to, (a)a separate building, (b)an open public thoroughfare, or (c)an exterior open space that is protected from fire exposure from the building and that has access to an open public thoroughfare.

suite

means a single room or series of rooms of complementary use, operated under a single tenancy, and includes, (a)dwelling units, (b)individual guest rooms in motels, hotels, boarding houses, rooming houses and dormitories, and (c)individual stores and individual or complementary rooms for business and personal services occupancies.

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