SECTION
406 MOTOR-VEHICLE-RELATED OCCUPANCIES
406.6
Repair garages.
406.6.1 General. Repair
garages shall be constructed in accordance with the International
Fire Code and this section. This occupancy shall not
include motor fuel-dispensing facilities, as regulated in
Section 406.5.
406.6.2 Mixed uses. Mixed
uses shall be allowed in the same building as a repair garage
subject to the provisions of Section
508.3.
406.6.3 Ventilation.
Repair garages shall be mechanically ventilated in accordance
with the International Mechanical Code. The
ventilation system shall be controlled at the entrance to
the garage.
406.6.4 Floor surface.
Repair garage floors shall be of concrete or similar noncombustible
and nonabsorbent materials.
Exception: Slip-resistant,
nonabsorbent, interior floor finishes having a critical radiant
flux not more than 0.45 W/cm2,
as determined by
NFPA253, shall be permitted.
406.6.5 Heating equipment.
Heating equipment shall be installed in accordance with
the International Mechanical Code.
[F] 406.6.6 Gas detection
system. Repair garages used for repair of vehicles fueled
by non odorized gases, such as hydrogen and non odorized
LNG, shall be provided with an approved flammable gas-detection
system.
[F] 406.6.6.1 System design.
The flammable gas-detection system shall be calibrated
to the types of fuels or gases used by vehicles to be
repaired. The gas detection system shall be designed to
activate when the level of flammable gas exceeds 25 percent
of the lower explosive limit. Gas detection shall also
be provided in lubrication or chassis repair pits of garages
used for repairing non odorized LNG-fueled vehicles.
[F] 406.6.6.2 Operation.
Activation of the gas detection system shall result in
all of the following:
1.
Initiation of distinct audible and visual alarm signals
in the repair garage.
2.
Deactivation
of all heating systems located in the repair garage.
3.
Activation of the mechanical ventilation system, where
the system is interlocked with gas detection.
[F] 406.6.6.3 Failure of
the gas detection system. Failure of the gas detection
system shall result in the deactivation of the heating
system, activation of the mechanical ventilation system
when the system is interlocked with the gas detection
system and cause a trouble signal to sound in an approved
location.
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