Plenum Protection
The R-102 system uses the 1W nozzle or the 1N nozzle for
plenum protection. The 1W nozzle is stamped with 1W and
the 1N nozzle is stamped with 1N, indicating they are one-flow
nozzles and must be counted as one flow number each. When
protecting a plenum chamber, the entire chamber must be
protected regardless of filter length.
VERTICAL PROTECTION – GENERAL
1W NOZZLE – SINGLE AND “V” BANK PROTECTION
One 1W nozzle will protect 4 linear feet (1.2 m) of plenum. The
maximum distance from the end of the hood to the first and last
nozzle must be no more than 2 ft (0.6 m). After the first nozzle,
any additional nozzles must be positioned at a maximum of 4 ft
(1.2 m) apart down the entire length of the plenum. The plenum
width must not exceed 4 ft (1.2 m). (The 1W nozzle can be used
on single or V-bank filter arrangements.) See Figure 4-6.
FIGURE 4-6
000197
When protecting plenums with the 1W nozzle, two options of
coverage are available:
Option 1:
The 1W nozzle must be on the center line of the
single or “V” bank filter and positioned within 1-20 in.
(26-508 mm) above the top edge of the filter. See
Figure 4-7.
FIGURE 4-7
000199
Option 2:
The 1W nozzle must be placed perpendicular, 8-12 in.
(203-304 mm) from the face of the filter and angled to
the center of the filter. The nozzle tip must be within
2 in. (50 mm) from the perpendicular center line of the
filter. See Figure 4-8.
FIGURE 4-8
000200
HORIZONTAL PROTECTION – OPTION 1
1N NOZZLE SINGLE BANK PROTECTION
One 1N nozzle will protect 10 linear feet (3.0 m) of single filter bank
plenum. The nozzle(s) must be mounted in the plenum, 2 to 4 in.
(50 to 102 mm) from the face of the filter, centered between the
filter height dimension, and aimed down the length. The nozzle
must be positioned 0-6 in. (0-152 mm) from the end of the hood to
the tip of the nozzle. See Figure 4-9.
FIGURE 4-9
2 FT (0.6 m)
MAXIMUM
4 FT (1.2 m)
MAXIMUM
4 FT (1.2 m)
MAXIMUM
2 FT (0.6 m)
MAXIMUM
4 FT (1.2 m)
MAXIMUM
20 IN. (508 mm)
MAXIMUM
1 IN. (26 mm)
MINIMUM
20 IN. (508 mm)
MAXIMUM
1 IN. (26 mm)
MINIMUM
NOZZLE TIP
MUST BE WITHIN
THIS AREA
4 IN.
(101 mm)
12 IN. (305 mm)
MAXIMUM
8 IN. (204 mm)
MINIMUM
000201
2 – 4 IN.
(50 – 12 mm)
000202
10 FT (3.0 m)
MAXIMUM
SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 4-5
R-102 Restaurant Fire Suppression Manual
