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 TM 55-1905-223-SDC
Section XV. PRECAUTIONS IN VENTILATING
6-27. PRECAUTIONS. When it has been definitely determined that the fire has been completely
extinguished, natural ventilation and forced ventilation, either by the installed systems or by portable
ventilating fans, can be used very advantageously for clearing compartments of smoke and fumes. However,
prior to the introduction of ventilation, either natural or mechanical, certain precautions must be observed:
a. Determine that the fire has been extinguished.
b. After FM-200 release, the atmosphere must be tested to ensure safe levels of HF gas before
personnel may re-enter the space.
c. Investigate the ventilating systems to the affected area to make sure they are free from fire or
smoldering material.
d. Have fire parties and equipment standing by the blower and controller of the ventilating system.
e. Have permission of the Engineering Officer to open the ventilating system closures and start the
blower as required to ventilate the compartment.
Exhaust systems should be used for clearing compartments of smoke fumes resulting from fires. The
use of exhaust systems will create an in draft from adjacent spaces and prevent the smoke and fumes from
spreading. Supply systems, if used, normally will force smoke and fumes into adjacent spaces causing
possible smoke damage and further inconvenience to personnel. Spaces directly open to weather decks can
be cleared conveniently by use of supply systems.
Section XVI. USE OF PORTABLE VENTILATING BLOWERS
PORTABLE EQUIPMENT. Portable ventilating blowers are basically auxiliary equipment, and
6.28
normally are not as efficient or convenient as permanent ventilating systems. However, in the presence of
explosive vapors or fumes, it maybe unsafe to use the permanent systems, and only portable ventilating
blowers equipped with explosion-proof motors can be used.
The axial-type blower is driven by an explosion-proof motor. It should be pointed out that while these
motors are explosion-proof when assembled BY the factory, the explosion-proof quality is not necessarily
present after overhaul; and where there is a possibility of explosive vapors being present, the air turbine
blower should be used in lieu of the electric-driven blower with an overhauled motor.
6-24 Change 1
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