SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-58 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
OVERLAPPING NOZZLE COVERAGE (Continued)
TABLE 1
Overlapping Nozzle Coverage (Zone Protection)
Appliance Type
Maximum Cooking Hazard
Fryer
34 in. (863 mm) Deep x 5.8 ft
2
(0.5 m
2
)
Griddle
30 in. (762 mm) Deep x Unlimited Length
Range
30 in. (762 mm) Deep x Unlimited Length
Wok, Maximum
30 in. (762 mm) Diameter x 8 in.
(203 mm) Deep
Wok, Minimum
11 in. (279 mm) Diameter x 3 in.
(76 mm) Deep
Braising Pan/Tilt
34 in. (863 mm) Deep x Unlimited Length
Skillet*
Lava Rock
26 in. (660 mm) Deep x Unlimited Length
Char-Broiler
(see Note 1)
Charcoal Broiler
30 in. (762 mm) Deep x Unlimited Length
(4 in. (101 mm) Maximum Fuel Depth)
Mesquite Wood
30 in. (762 mm) Deep x Unlimited Length
Broiler
(6 in. (152 mm) Maximum Fuel Depth)
Gas Radiant
36 in. (914 mm) Deep x Unlimited Length
Char-Broiler
Electric Char-Broiler 34 in. (863 mm) Deep x Unlimited Length
* See Figure 4-113 for nozzle location
Note 1:
Always try to place Lava Rock Char-Broiler(s) near the center of the
zone. When the Lava Rock Char-Broiler is the first or last appliance in the zone,
the outside edge of the broiler must not be more than 6 in. (152 mm) outside the
end nozzle.
FIGURE 4-113
006927
Overlapping Appliance Nozzle and Hazard Zone Locations
1. All overlapping appliance nozzles must be the 245 nozzle
for “end of zone” protection and the 260 nozzle for zone
protection, and must be located under a common hood at
the same height above the hazard zone, in a straight line
from right to left and aimed at the centerline of the hazard
zone. The overlapping nozzle is used for both continuous
overlapping and multiple group overlapping protection.
2. The hazard zone must be positioned (located) so that all
appliance hazard surfaces are within the zone. For appli
-
ance hazard surfaces smaller than the standard hazard
zone size, the hazard surface can be located anywhere
within the standard hazard zone. For appliance hazard
surfaces with listed protection exceeding the standard
hazard zone size of 28 in. (711 mm) in depth (see Table
4-1), the hazard surface(s) must be aligned with the back
edge of the hazard zone, with the front edge overhanging
the front of the zone.
3. The overlapping appliance nozzles must be located 40 in. to
45 in. (1016 mm to 1143 mm) above the top surface of the
protected appliances. See Figure 4-115.
Exception No. 1: Nozzle dimensions for wok protection are
measured to bottom of wok. Exception No. 2: When using
overlapping appliance nozzles in areas where there is a
back shelf, the nozzle cannot be positioned in the shaded
area as shown in Figure 4-114.
Also, back shelf must not extend more than 11 in. (279
mm) over the hazard zone and cannot be less than 18 in.
(458 mm) above the hazard zone. See Figure 4-114.
FIGURE 4-114
006914
COVER MUST NOT
INTERFERE WITH
EDGE OF
DISCHARGE
PATTERN
0-12 IN.
(0-304 mm)
40-45 IN.
(1016-1143 mm)
ZONE CENTER LINE
ZONE
18 IN.
(458 mm)
MINIMUM
OVERLAPPING NOZZLE(S)
CANNOT BE POSITIONED
IN THIS SHADED AREA
12 10 8 6 4 2
45
44
43
42
41
40
CENTER LINE OF
HAZARD ZONE
11 IN. (279 mm)
MAXIMUM
BACK
SHELF
28 IN. (711 mm)
