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.
Main Ventilation Air for Fireplace Compartment
of 21C12 and 21C12A Structures
AIR OUT AT
315 degrees C L/s
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
The fan motor should be sized for bringing the
lowest ambient air temperature expected through the
louvers and exhausting it at the same temperature.