User's Manual

Design
P/N 81-CO2MAN-001 3-13 September 2013
3-5.2.4.2 Forced Ventilation
Additional carbon dioxide must be provided for any loss of agent due to forced ventilation in
the protected area that cannot be shut off or dampered prior to or at the start of discharge.
The additional quantity of agent is calculated by dividing the amount of volume moved by the
ventilating system during the designed duration of protection, lasting at least 1 minute, by the
appropriate flooding factor for the enclosure volume from Table 3-2. The calculated quantity is
multiplied by the material conversion factor from Figure 3-1 when the required suppression
concentration is greater than 34%. The additional carbon dioxide required to compensate for
continuing ventilation shall be combined with the basic concentration quantity.
(Equation 7)
or
Where:
= Quantity of agent to compensate for forced ventilation, lb. (kg)
= Ventilation air flow rate,
ft.
3
/min (m
3
/min)
= Duration of protection  1 minute, min
= Volume factor from Table 3-2 used in Equation (1),
ft.
3
/lb. (m
3
/kg)
= Volume factor from Table 3-2 used in Equation (1), lb./
ft.
3
(kg/m
3
)
= Material conversion factor from Figure 3-1 used in Equation (2)
From Equation (6)
Where is the Quantity of Agent Lost and is the Duration of Protection.
W
L
q
L
t
p
=
W
L
t
P
t
p
1 min.=
W
L
q
L
t
p
=
W
L
81=
W
L
8 lb.=
W
V
q
V
t
p
f
C
f
1
=
Wv q
V
t
p
f
2
f
C
=
W
V
qV
t
P
f
1
f
2
f
C