21
Appliance Protection
The EWC system utilizes both overlapping and dedicated nozzle appliance coverage, depending on the
type of cooking appliance(s) requiring protection.
Overlapping appliance coverage allows a given area under the hood, defined as the hazard zone, to be
protected by overlapping (TF1) nozzles. Nozzles are evenly spaced at the same height and alignment
(front-to-back) relative to the hazard zone.
Dedicated appliance protection utilizes an ADP nozzle (or nozzles) for protection of an individual
appliance.
Overlapping, dedicated appliance, plenum, and duct protection may be incorporated in a single pipe
network on the EWC extinguishing system.
The following sections detail the different nozzle coverage and placement parameters for overlapping and
dedicated nozzle appliance protection methodologies.
Overlapping Appliance Protection
A single hazard zone utilizing overlapping coverage is 30” deep, by the total length of the cooking surface
of the protected appliances. The cooking surfaces of all appliances protected by overlapping nozzles must
be located within the defined hazard zones. Cooking appliances eligible for overlapping protection are
. The lowest and highest cooking surfaces will determine the height of the
fire suppression nozzles. All overlapping nozzles must be mounted at the same height in a single hazard
zone. Overlapping protection uses TF1 nozzles only.
For applications where overlapping protection cannot be used, such as an upright boiler, dedicated
appliance protection must be used.
Figure 23 - Overlapping Protection Option
15”
12” Max
12” Max
15”
Cooking
Appliances
Cooking
Appliances
40” Min
45” Max
40” Min
45” Max
24”
Max
24”
Max
Overlapping Hazard Zone
End of
Hazard
Zone
End of
Hazard
Zone
Summary of Contents for EWC
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