c) The pit fire, B3, or B4 portion is the same as for
the 19F3 and 19F3B structures.
d) A 4572 mm by 4572 mm locker with an exterior
access should be provided for OBA storage and should be designed
as a repair locker. Standard OBA cabinets should be provided in
the OBA locker. A wild hose demonstration area is required for
teaching in the 19F3A and 19F3C structures. Where the climate
allows year around training outside, the wild hose demonstration
area should be outside. Trainees would watch the demonstration
from the open sides of the staging area. In severe weather
locations, the wild hose area should be provided in an area
enclosed on three sides with the trainee side open. Means with
unrestricted visibility should be provided to protect the
bleacher from the hose water spray (a Plexiglas barrier meets
this requirement). Refer to par. 2.4.2. Water should come from
the HS2 hose station on the opposite side of the staging area.
e) Bleachers should be required in the 19F3A and
19F3C structures and should be capable of seating 120 people.
f) Demonstrations of portable extinguishers should be
conducted on the B3 side of the staging area.
g) The staging area should be constructed of concrete
or steel grating with appropriate floor drains. If bulk dry
storage is to be located underneath the staging area, then a
waterproof construction should be used. Subsurface storage
should not be considered where there is a high water table or
where flooding is probable. At least one-third of ventilation
air for pit fireplace exhaust fans should be supplied into
h) The ventilation system should be manifolded such
that Compartments 1, 2, 5, and 6 are on a separate system served
by two equal sized exhaust fans. Compartments 3, 4, 7, and 8
should be on a separate system served by one exhaust fan.
220.127.116.11 Doors and Hatches. Doors leading from Compartments 1
and 2 to the staging area should be quick acting and watertight
with 180 degree swing. The door leading to Compartment 2 should
be installed in a removable panel such that when the door and
panel are removed, a 914 mm by 2134 mm minimum opening is