User's Manual

Design
September 2013 3-8 P/N 81-CO2MAN-001
3-5.2.3 MATERIAL CONVERSION FACTOR
As shown in Table 3-1, many combustible materials require a carbon dioxide concentration that
is higher than 34% for suppression. When such materials are present, the basic quantity of
carbon dioxide shall be increased by the appropriate Material Conversion Factor, as
determined from the curve shown in Figure 3-1.
(Equation 2)
Where:
= Quantity of agent for given concentration, lb.(kg)
= Basic quantity of agent from Equation (1), lb.(kg)
= Material conversion factor from Figure 3-1
Figure 3-1. Minimum Design CO
2
Concentration

 Reprinted with permission from NFPA 12-2005. Carbon Dioxide Extinguishing Systems, Copyright © 2005, National Fire Prevention Association,
Quincy, MA 02169. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented
only by the standard in its entirety
W
B
W
C
W
B
f
C
=
W
C
W
B
f
C