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1020.1.3 Ventilation. Equipment and ductwork for
exit enclosure ventilation as permitted by Section
1020.1.2 shall comply with one of the following items:
1. Such equipment and ductwork shall be located
exterior to the building and shall be directly
connected to the exit enclosure by ductwork
enclosed in construction as required for shafts.
2. Where such equipment and ductwork is located
within the exit enclosure, the intake air shall be
taken directly from the outdoors and the
exhaust air shall be discharged directly to the
outdoors, or such air shall be conveyed through
ducts enclosed in construction as required for
3. Where located within the building, such
equipment and ductwork shall be separated
from the remainder of the building, including
other mechanical equipment, with construction
as required for shafts.
4. Unitary HVAC equipment utilizing refrigerant or
chilled and hot water for cooling and heating,
such as fan coil units, shall be permitted to be
installed within the exit enclosure.
Noncombustible supply, return and condensate
piping required for the operation of the fan coil
unit, shall be allowed to penetrate the exit
enclosure at one location each.
In each case, openings into the fire-resistance-rated
construction shall be limited to those needed for
maintenance and operation and shall be protected by
opening protectives in accordance with Section 715 for
Exit enclosure ventilation systems shall be
independent of other building ventilation systems.
1203.6 Alternative mechanical system. “Heating,
ventilating and air conditioning (HVAC) systems in
occupancies reviewed under NFPA 101 pursuant to
Section 115.1 of this code shall be installed in
accordance with NFPA 90A or NFPA 90B in lieu of the
mechanical code listed in Chapter 35.”