Range Protection (With or Without Back Shelf/Obstruction)
When this type of hazard is equipped with a back shelf or other
similarly sized obstruction located above the range top, two
protection options are available: One requires a 1F nozzle and
the other option requires a 260 nozzle.
Range Protection 1F (1-Flow) Nozzle (With or Without Back
Shelf/Obstruction)
Single and multiple burner ranges can be protected using a
1F nozzle. The nozzle is stamped with 1F indicating that it is a
one-flow nozzle and must be counted as one flow number.
When using the 1F nozzle for range protection with or without back
shelf or other similarly sized obstruction, the maximum length of
the burner grates being protected must not exceed 28 in. (711
mm) and the maximum area of the burner grates must not exceed
336 in.
2
(21677 mm
2
). See Figure 4-37 for nozzle location details.
FIGURE 4-37
000238
Range Protection 260 (2-Flow) Nozzle (With or Without
Back Shelf/Obstruction)
Single and multiple burner ranges can be protected using a 260
nozzle. The nozzle is stamped with 260 indicating that it is a
two-flow nozzle and must be counted as two flow numbers.
When using the 260 nozzle for range protection with or without
back shelf or other similarly sized obstruction, the maximum
length of burner grates being protected must not exceed 32 in.
(812 mm) and the maximum area of the burner grates must
not exceed 384 in.
2
(24774 mm
2
). Nozzle must be located on
the front edge of the burner grates and aimed at a point 10 in.
(254 mm) from the back edge of the burner grates. Nozzle must
be mounted 30 to 40 in. (762 to 1016 mm) above the hazard
surface. See Figure 4-38.
FIGURE 4-38
000238a
1F NOZZLE LOCATED OVER FRONT EDGE OF BURNER GRATE AND ORIENTED
SO NOZZLE TIP FLATS ARE PARALLEL WITH BURNER GRATE FRONT TO REAR
CENTERLINE AND SHALL BE AIMED AT THE CENTER OF THE COOKING SURFACE.
1F NOZZLE
SHELF OR OTHER SIMILARLY SIZED
OBSTRUCTION CAN OVERHANG BURNER(S)
BY A MAXIMUM OF 11 IN. (279 mm)
40 - 48 IN.
(1016 - 1219 mm)
AIM
POINT
20 IN.
(508 mm)
MINIMUM
14 IN.
(355 mm)
MAXIMUM
14 IN.
(355 mm)
MAXIMUM
FRONT TO REAR
CENTERLINE
12 IN.
(304 mm)
MAXIMUM
260 NOZZLE
SHELF OR OTHER SIMILARLY SIZED
OBSTRUCTION CAN OVERHANG BURNER(S)
BY A MAXIMUM OF 11 IN. (279 mm)
30 - 40 IN.
(762 - 1016 mm)
18 IN.
(457 mm)
MINIMUM
10 IN.
(254 mm)
FROM BACK
OF BURNER
GRATES
SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 4-17
R-102 Restaurant Fire Suppression Manual
Summary of Contents for R-102
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