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Duct and Plenum Protection
The EWC extinguishing system for duct and plenum coverage can be provided by independent EWC tanks
and piping or integrated with the EWC tanks and piping used for protection of the appliances.
Plenum Protection
The ADP nozzle is used to protect plenum areas in both single bank and v-bank plenum configurations. A
single ADP nozzle will protect up to a 4' wide x 10' long plenum section. For larger plenum areas,
additional ADP nozzles are added as required, with each nozzle protecting no more than a 4' wide by 10'
long plenum section. ADP nozzles may be installed pointing in the same direction, and/or at opposite ends
of the plenum, pointing toward each other. ADP nozzles must not be installed back-to-back when
protecting plenum areas. When positioned at the end of the plenum, nozzles must be installed from 0 to 6"
into plenum.
ADP nozzle locations for plenum protection are shown in Figure 18 and Figure 19.
Figure 18 - Single Bank Filter Plenum
*Isolated Plenum Place for Clarity
TOP VIEW
*Isolated Plenum Place for Clarity
Plenum
Nozzle
4' Max
Plenum
Nozzle
SIDE VIEW
4' Max
10' Max
0-6"
Height
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