Table 1 Main Ventilation Air for Fireplace Compartment

Design: Navy Firefighting School Facilities - index
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82

MIL-HDBK-1027/1B

d) Manually adjustable inlet dampers should be

provided for flow adjustment and segregation for maintenance.

e) Provide pressure drop indication across each fire

compartment exhaust fan. The analog indication signal should be

routed to a remote indicator in the instructor's station and

then to the DTC. In addition, a pressure switch(es) should be

provided which will sense the differential pressure across each

fire compartment exhaust fan. The switch should have an

adjustable setpoint that when reached will shut off the fan and

send a binary signal to the DTC. The setpoint should be chosen

to indicate impending fan surge or to ensure that the ductwork

will not implode. If the airflow is restricted too much, the

switch will stop the fan before equipment is damaged.

Table 1

Main Ventilation Air for Fireplace Compartment

of 21C12 and 21C12A Structures

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PROPANE

VENTILATION

DEMAND

AIR OUT AT

L/s

315 degrees C L/s

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34 456

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Notes: 1. Fan static pressure should be determined by

comparing two modes of operations:

During burner operation: bring 15 degrees C air

through the louvers and exhausting 315 degrees C

air through the exhaust system.

Between firefighting scenarios (burners off):

bring 15 degrees C air through the louvers and

exhausting 15 degrees C air through the exhaust

system.

The fan motor should be sized for bringing the

lowest ambient air temperature expected through the

louvers and exhausting it at the same temperature.

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