MIL-HDBK-1027/1B
design temperature is at night and only occurs during a small
percentage of the time. Such a system would provide
15.5 degrees C air 95 percent of the time.)
b) Design of the preheat system should not compromise
the crawl space purge requirement. The preferred preheat system
is to heat outside air and to distribute air over the louver,
motorized damper, and backdraft damper combination in the crawl
space. Air should be heated from outside ambient temperature to
a temperature hot enough to allow a mixed air temperature of
10 degrees C. Mixed air is comprised of cold outside air from
the louver combination units and hot air from the preheat
system. The preheat system should be designed to heat the
ventilation air by adequately mixing the air coming from louver
combination units and the preheat system when the fire
compartment exhaust fans are either exhausting 315.5 degrees C
air (burners operating) or 10 degrees C air (burners off).
3.11.9
Other Rooms
3.11.9.1 Burner and Electrical Rooms. Some training structures
have separate burner and electrical rooms. These rooms should
be provided with filtered ventilation air which can be
discharged directly to the outside, separate from the facility
ventilation system. Fans in these rooms should run continuously
while training is being conducted in that portion of the
building. Control for this system should be by an HOA switch
wired to the DTC. When there is no propane burner in the
electrical room, the ventilation is for summer heat removal and
should be controlled by a local wall switch in parallel with a
thermostat. This ventilation does not apply to air conditioned
electrical rooms associated with the instructor's station.
Doors for electrical rooms should be 1200 mm wide.
3.11.9.2 Escape Trunks. Escape trunks should be provided with
an exhaust fan located just below the roof hatch. This wall
mounted fan should be wired to the DTC in the instructor's
station so that anytime the escape trunk becomes too hot for
training, the instructor can activate the fan. The exhaust fan
for the escape trunk should be thermostatically controlled and
should interface with the DTC.
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