Div. B › Part 3 › 3.1 › 3.1.8 — Fire Separations and Closures

3.1.8.10 — Twenty-Minute Closures

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(1) A door assembly having a fire-protection rating not less than 20 min is permitted to be used as a closure in,

(a) a fire separation not required to have a fire-resistance rating more than 1 h, located between,

(i) a public corridor and a suite,

(ii) a corridor and adjacent sleeping rooms, or

(iii) a corridor and adjacent classrooms, offices and libraries in Group A, Division 2 major occupancies, or

(b) a fire separation not required to have a fire-resistance rating more than 45 min, located in a building not more than 3 storeys in building height.

(2) The requirements for noncombustible sills and combustible floor coverings in NFPA 80, “Fire Doors and Other Opening Protectives”, do not apply to a door described in Sentence (1).

(3) A door described in Sentence (1) shall have a clearance not more than 6 mm at the bottom and not more than 3 mm at the sides and top.

(4) In elementary and secondary schools, a door assembly conforming to Articles 9.10.13.2. and 9.10.13.3. is permitted to be used as a closure in a fire separation having a fire-resistance rating of 30 min.

OBC Definitions

Defined terms on this page

building height

means the number of storeys contained between the roof and the floor of the first storey.

closure

means a device or assembly for closing an opening through a fire separation or an exterior wall, such as a door, a shutter, a damper, wired glass and glass block, and includes all components such as hardware, closing devices, frames and anchors.

combustible

means that a material fails to meet the acceptance criteria of CAN/ULC-S114, “Test for Determination of Non-Combustibility in Building Materials”.

fire separation

means a construction assembly that acts as a barrier against the spread of fire.

fire-protection rating

means the time in minutes or hours that a closure will withstand the passage of flame when exposed to fire under specified conditions of test and performance criteria, or as otherwise prescribed in this Code.

fire-resistance rating

means the time in minutes or hours that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria, or as determined by extension or interpretation of information derived from that test and performance as prescribed in this Code.

major occupancy

means the principal occupancy for which a building or part of a building is used or intended to be used, and is deemed to include the subsidiary occupancies that are an integral part of the principal occupancy. The major occupancy classifications used in this Code are as follows: (a)Group A, Division 1 - Assembly occupancies intended for the production and viewing of the performing arts, (b)Group A, Division 2 - Assembly occupancies not elsewhere classified in Group A, (c)Group A, Division 3 - Assembly occupancies of the arena type, (d)Group A, Division 4 - Assembly occupancies in which occupants are gathered in the open air, (e)Group B, Division 1 - Detention occupancies, (f)Group B, Division 2 - Care and treatment occupancies, (g)Group B, Division 3 - Care occupancies, (h)Group C - Residential occupancies, (i)Group D - Business and personal services occupancies, (j)Group E - Mercantile occupancies, (k)Group F, Division 1 - High hazard industrial occupancies, (l)Group F, Division 2 - Medium hazard industrial occupancies, and (m)Group F, Division 3 - Low hazard industrial occupancies.

noncombustible

means that a material meets the acceptance criteria of CAN/ULC-S114, “Test for Determination of Non-Combustibility in Building Materials”.

occupancy

means the use or intended use of a building or part of a building for the shelter or support of persons, animals or property.

public corridor

means a corridor that provides access to exit from more than one suite.

storey

means , except for the purposes of Part 7 of Division B, the portion of a building, (a)that is situated between the top of any floor and the top of the floor next above it, or (b)that is situated between the top of the floor and the ceiling above the floor, if there is no floor above it.

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.

building

(a) a structure occupying an area greater than ten square metres consisting of a wall, roof and floor or any of them or a structural system serving the function thereof including all plumbing, works, fixtures and service systems appurtenant thereto,
(b) a structure occupying an area of ten square metres or less that contains plumbing, including the plumbing appurtenant thereto,
(c) plumbing not located in a structure,
(c.1) a sewage system, or
(d) structures designated in the building code; Act

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