When the Positive Airflow Shut Off is activated by the firefighter pulling the Emergency
Fan Stop switch, air pressure from the fans, and gravity, and a spring, will act to close the
positive shut off doors and keep them closed. A red LED at the junction box will come
on. The Positive Airflow Shut Off must be manually reset to prevent inadvertent reset in
an actual shut off event.
To reset, Open the Positive Shut off System switch. Remove the front screen. Lift the
doors up. Reset the latches. Then close the front screen.
Positive shut off doors closed Latch Doors reset
Louvered dampers on the exterior of the unit will prevent domestic air from escaping
from the room during non-operation. The fans will blow these louvered dampers open
and gravity will close them. These louvered dampers do add a restriction to the airflow
and will decrease the CFM somewhat.
Louver open
Louver closed
Installation
The battery room ventilator unit comes as three separate pieces. The unit that is in the
battery room, is 24" x 24" square. To accommodate airflow, and to service the unit a
clearance of 4 feet is recommended from the wall in front of the unit. There is a flange
that is factory adjustable but normally is located 6 inches from the back of the unit. If the
wall is made in the concrete block or a concrete wall, the unit is attached to the wall by
others using normal fasteners. The second part of the unit consists of a louvered damper
and third is a jack which provides environmental protection for the outside of the unit.
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