SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 4-57
R-102 Restaurant Fire Suppression Manual
OVERLAPPING NOZZLE COVERAGE (Continued)
Overlapping Coverage – Option 2
For each group of protected appliances under a common
hood(s), the overlapping nozzles must be located from right
to left so that each end nozzle is located a maximum of 11.5
in. (292 mm) inside the outside edge of the cooking hazard of
each end appliance, and the inside overlapping nozzles must be
located between the two end nozzles at a maximum spacing of
25.5 in. (647 mm).
Hazard Zone
The hazard zone is dened as a theoretical, at and level, rect-
angular surface, that includes all of the cooking hazards of the
protected appliances under a common hood(s). The purpose of
the hazard zone is to provide a means of locating the appliances
and the overlapping nozzles, as well as aiming the overlapping
nozzles. The hazard zone measures 28 in. (711 mm) deep by
the length of the cooking hazard(s). The centerline of the hazard
zone must bisect the 28 in. (711 mm) depth (from front to back)
and run from right-to-left for the full width of the hazard zone.
Overlapping Nozzle Appliance Protection
Overlapping Nozzle Appliance Protection is dened as protec-
tion of cooking appliances by nozzles spaced uniformly at
uniform elevations under a common hood(s). Overlapping
protection of appliances is continuous for the full length of the
hood or divided when group(s) of protected appliances are
separated by counters or appliances not requiring protection.
Full hood continuous protection is dened as overlapping
nozzle appliance protection that covers the appliance line-up
located under the total hood length. All appliances requiring
protection are the appliances under the hood that can be an
ignition source of grease in the hood, grease removal device or
the duct.
Group protection is dened as overlapping nozzle appliance
protection that protects individual hazard zones located under a
common hood. These “groups” of appliances may be separated
by appliances not requiring protection, such as steam equipment
or work tables, or by dedicated appliance protection, such as
salamander broilers.
See Figure 4-116 (full hood continuous protection) and Figure
4-117 (multiple group protection).
Dedicated Nozzle Appliance Protection
Appliance protection using dedicated nozzle coverage is dened
as protection of cooking appliances with enclosed cooking
hazards, such as upright broilers, which cannot be protected
with overlapping nozzles and therefore must be protected with
nozzles dedicated to the appliance.
General Design Limitations
• If overlapping appliance protection is mixed with dedi-
cated appliance protection on the same pipe system, THE
OVERLAPPING APPLIANCE PROTECTION PIPING
REQUIREMENTS MUST BE FOLLOWED.
• Overlapping protection requires the use of 3.0 gal (11.4 L)
tank(s) and a maximum of six ows per tank.
• In installations using tanks only intended for overlapping
protection, a single Double Tank nitrogen expellant gas
cartridge can be utilized with up to three 3.0 gal (11.4 L) tanks.
• In installations using both overlapping protection and conven-
tional non-overlapping protection (ex. hood/duct or dedicated
appliance protection), a single Double Tank nitrogen expellant
gas cartridge can be utilized with up to three 3.0 gal (11.4 L)
tanks, as long as none of the 3.0 gal (11.4 L) tanks exceed a
total ow output of more than six ows.
• If more than six ows will be used in a conventional non-over-
lapping tank, it cannot share the same cartridge as tanks
intended for overlapping protection. In this case, an additional
Regulated Actuator Assembly with another expellant gas
cartridge will be required.
• The 245 nozzle must be used for “end of zone” protection.
• The 260 nozzle must be used for zone protection.
• Maximum depth of zone is 28 in. (711 mm).
• Refer to overlapping system piping requirements listed in
Table 4-2.
• Nozzle must be located 0 in. to 12 in. (0 mm to 304 mm)
forward of zone centerline, aimed back at the zone centerline.
• Nozzles must be spaced a maximum of 11.5 in. (292 mm)
from each end of hazard and then a maximum of 25.5 in. (647
mm) on center for the remaining overlapping nozzles until the
complete hazard is covered.
• For appliance hazard surfaces with listed protection exceed-
ing the standard hazard zone of 28 in. (711 mm) in depth, the
hazard surface(s) must be aligned with the back edge of the
hazard zone, with the front edge overhanging the front edge
of the zone. See Appliance Chart, Table 4-1.
• For appliance hazard surfaces that exceed the listed protec-
tion sizes, multiple zones must be utilized. Align entire hazard
surface area within the multiple zones.
• All hood, duct, and individual appliance protection are as spec-
ied in the R-102 Design, Installation, Recharge and Maint en-
ance Manual (Part No. 418087).
• All appliance protection currently listed in the R-102 Design
Manual (Part No. 418087) is also approved protection. Zone
protection can be considered optional protection.
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