26 September 2006
Exception: Toilet rooms, bathrooms, shower rooms, sink closets, and similar
auxiliary spaces may have air transfer openings, unless prohibited by NFPA 101,
such as in residential occupancies.
Plenums may be used as an integral part of an air handling system only if they
conform to the requirements of NFPA 90A. Under no circumstances may
combustible materials be located within the plenum space. Electrical wiring
passing through the space, including telephone and communication wiring, must
be plenum rated or must be in metal conduit. Rooms or areas that form a
plenum space or that are used as a plenum must not be occupied for any
purpose except during repairs or maintenance operations to the air handling
Smoke and Heat Vents.
Smoke and heat vents may be considered in buildings where a high rate of heat
release is anticipated during a fire. In buildings without automatic sprinklers,
smoke and heat vents must be arranged to operate automatically in accordance
with NFPA 204, Smoke and Heat Venting. In buildings with automatic sprinkler
protection, smoke and heat vents must be arranged to operate in the manual
mode only. Skylights are the preferred method of providing manual smoke and
PLASTIC PIPE AND CONDUIT
Penetrations by plastic pipe or conduit through fire-rated walls, partitions, shafts,
and floors must be fire-stopped by an approved or listed method in accordance
with ASTM E814, Standard Test Method for Fire Tests of Through-Penetration
Fire Stops or UL 1479, Fire Tests of Through-Penetration Firestops.
Plastic pipe and conduit must not be installed in exit stair enclosures, or in air
plenum spaces unless specifically listed for that application.
FIRE RETARDANT TREATED (FRT) PLYWOOD
Use of FRT plywood is prohibited, except as permitted by the IBC. FRT plywood
must not be used in any part of the roof or roofing system.