DUCT PROTECTION LIMITATIONS –
TWO NOZZLES (2 x P/N 16416)
Two Amerex Duct Nozzles (P/ N 1 6 4 1 6 ) will protect ducts with a perimeter
of 51 inches to 84 inches (129.5 – 208.3 cm) or a maximum diameter of 26
inches (66 cm). To correctly position the nozzles in a rectangular duct divide
the duct along its longest side into four equal distances. A circular duct
should be divided along a centerline into four equal distances. A nozzle
should be placed at one quarter of the duct’s width (or diameter) with both
nozzles on the centerline, paced 2-8 inches (5.08 - 20.3 cm) into the duct
opening and aimed at the center of the modular cross
section of the duct. Each nozzle has one flow point.
NOTE:
In no case can the diagonal dimension of
each
module
exceed 18.8 inches (46 cm).
DUCT PROTECTION LIMITATIONS – MULTIPLE NOZZLES (P/N 16416)
Protecting ducts larger than 84 perimeter inches (208.3 cm) utilizing the single flow point nozzle (P/N 16416).
Divided the perimeter by 42 (104 cm) and round up to the next whole number. Divide the duct cross section
into the same number of equally sized modules. Check the modules to insure they are equal to or less than
50 perimeter inches and have a diagonal equal to or less than 18.8 inches. If they meet the criteria then
place a duct nozzle in the center of each module, 2”-8” into the hood/duct opening.
DUCT PROTECTION LIMITATIONS 100 IN. PERIMETER
TWO – 1½ FLOW POINT NOZZLES (P/N 11983)
The Amerex Solid Fuel Appliance/Duct Nozzle (P/N 11983) is listed
to protect a restaurant cooking exhaust duct of unlimited length,
unlimited changes in direction and up to 100 perimeter inches (254
cm) or 32 inch diameter (81.2 cm) using two nozzles. The nozzles
total three flow points and to properly position the nozzles, a
rectangular duct should be divided along its longest side into four
equal distances. A circular duct should be divided along its center
line into four equal distances. The nozzles are to be placed at one
quarter and three quarters position of the duct width (or diameter)
with both nozzles on the center line, placed 2 - 8
inches (5.08 – 20.3 cm) into the duct opening and
aimed straight up in a vertically run duct.
NOTE
: In no case can the diagonal dimension of
the duct exceed 37.2 inches (94.4 cm)
without adding additional duct nozzles
.
December 2008
Section 3
Design
Page 3 – 2
Amerex Restaurant Fire Suppression System (EX 4658)
1/
4
1/2
1/4
26" MAX. DIA.
1/4
1/
4
1/2
32" MAX
NOTE
: The use of one Duct Nozzle P/N 11983 is
permitted for duct 50 perimeter inches or
less in the
same manner as Duct Nozzle
16416.
8
”
34”
17
”
18.8”
18.8”
18.8”
18.8”
18.8”
18.8”
18.8”
18.8”
18.8”
18.8”
