Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 86

3. Enclosure
A smokeproof enclosure shall be enclosed from the highest point to
the lowest point by barriers having 2-hour fire resistance ratings.
Where a vestibule is used, it shall be within the 2-hour-rated enclosure
and shall be considered part of the smokeproof enclosure.
4. Vestibule
Where a vestibule is provided, the doorway into the vestibule shall be
protected with an approved fire door assembly having a 1½-hour fire
resistance rating, and the fire door assembly from the vestibule to the
smokeproof enclosure shall have not less than a 20-minute fire
resistance rating. Doors shall be designed to minimize air leakage and
shall be self-closing or shall be automatic-closing by actuation of a
smoke detector within three meters (3 m) of the vestibule door. New
doors shall be installed in accordance with NFPA 105, Standard for
the Installation of Smoke Door Assemblies.
5. Discharge
Every smokeproof enclosure shall discharge into a public way, into a
yard or court having direct access to a public way, or into an exit
passageway. Such exit passageways shall be without openings, other
than the entrance to the smokeproof enclosure and the door to the
outside yard, court or public way. The exit passageway shall be
separated from the remainder of the building by a 2-hour fire
resistance rating.
6. Access
For smokeproof enclosures other than those consisting of a pressurized
stair enclosure complying with para (9) hereof, access to the
smokeproof enclosure stair shall be by way of a vestibule or by way of
an exterior balcony.
7. Natural Ventilation
Smokeproof enclosures using natural ventilation shall comply with
para (3) hereof and the following:
a. Where access to the stair is by means of an open exterior balcony,
the door assembly to the stair shall have a 1½-hour fire resistance
rating and shall be self-closing or shall be automatic-closing by
actuation of a smoke detector. Openings adjacent to the exterior
balcony specified in the preceding paragraph shall be protected
b. Every vestibule shall have a net area of not less than one and a
half (1.5 m 2) of opening in an exterior wall facing an exterior court,
yard, or public space not less than six meters (6 m) in width.
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