SECTION 3 – SYSTEM DESIGN
UL EX3830 ULC EX3830
2014-NOV-10 REV. 06 PagE 3-3
KITCHEN KNIGHT II Restaurant Fire Suppression Manual
NOZZLE COVERAGE AND PLACEMENT (Continued)
Duct Protection (Continued)
Transition Ducts –
The protection of non-standard ducts should
be reviewed by the authority having jurisdiction. PYRO-CHEM
KITCHEN KNIgHT II recommends that transition ducts be
protected as follows:
a. Transition ducts – larger to smaller
In cases where the duct/plenum interface opening is larger
than the final exhaust duct, measure the perimeter/diameter
of the duct halfway between the largest and smallest section
(or the average perimeter/diameter). The nozzle is to be
located within 0 to 6 in. (0 to 152 mm) of the duct/plenum
interface (not at the point where the measurement was
taken), centered under the final exhaust duct opening. See
Figure 3-3.
Note: Nozzles to protect ducts with a transition that is
more than 4
ft (1.2 m) in height, will be required to be posi-
tioned in the opening of the transition from the hood 2 in. to
8 in. (51 mm to 203 mm) into the opening using standard
duct nozzle design parameters.
006173PC
1/2 WaY INTO
TRaNSITION
PERIMETER
MEaSUREMENT
FIGuRE 3-3
b. Transition ducts – smaller to larger
In cases where the duct/plenum interface opening is smaller
than the final exhaust duct, measure the perimeter/diame-
ter of the final exhaust duct. The nozzle(s) is to be located
within 0 to 6 in. (0 to 152 mm) of the duct/plenum interface,
centered in the opening. See Figure 3-4.
006174PC
PERIMETER
MEaSUREMENT
FIGuRE 3-4
c. Multiple risers
In cases of multiple rises, each riser is protected as an indi-
vidual duct. See Figure 3-5.
006175PC
DUCT
DUCT
PLENUM
FIGuRE 3-5
Electrostatic Precipitator
– Ducts utilizing electrostatic precip-
itators must be protected above and below the unit. Standard
duct nozzles are used in this application. See Figure 3-6.
006176PC
2D NOzzLE
2D NOzzLE
PRECIPITaTOR
PLENUM
FIGuRE 3-6
Plenum Protection
The Model 1H nozzle (Part No. 551029) is a one flow nozzle
used for plenum protection. a single 1H nozzle can protect a
plenum (with single or V-bank filters) 10 ft (3.0 m) long by 4 ft
(1.2 m) wide. Dividing the length into sections equal to or less
than 10 ft (3.0 m) in length and positioning a nozzle at the start
of each section can be done to protect longer plenums.
On V-bank plenums, the nozzle(s) must be located at the center
of the V-bank width, 1/3 of the vertical height of the filters. On
single filter bank plenums, the nozzle must be located 2 in. (50
mm) from the back edge of the filter, 1/3 down from the vertical
height. For either application, the nozzle must be located within
6 in. (152 mm) of the end of the plenum (or module) and aimed
directly down the length of the plenum. The nozzles may point
in the opposite directions as long as the entire plenum area is
protected, and the 10 ft (3.0 m) limitation is not exceeded. See
Figure 3-7.
