Nozzle Application Chart
The following chart has been developed to assist in calculating
the quantity and type of nozzle required to protect each duct,
plenum, or appliance.
Minimum Nozzle
Maximum Hazard Nozzle Nozzle Nozzle Stamping –
Hazard Dimensions Quantity Heights Part No. Flow No.
Duct or Transition Length – Unlimited 1 – 439839 1W
(Single Nozzle) Perimeter – 50 in. (1270 mm)
Diameter – 16 in. (406 mm)
Duct or Transition Length – Unlimited 1 – 439840 2W
(Single Nozzle) Perimeter – 100 in. (2540 mm)
Diameter – 31 7/8 in. (809 mm)
Duct or Transition Length – Unlimited 2 – 439840 2W
(Dual Nozzle) Perimeter – 150 in. (3810 mm)
Diameter – 48 in. (1219 mm)
Electrostatic Precipitator Individual Cell 1 – 439837 1/2N
(At Base of Duct)
Plenum Length – 10 ft (3.0 m) 1 – 439838 1N
(Horizontal Protection)
Plenum Length – 6 ft (1.8 m) 1 – 439839 1W
(Horizontal Protection) Width – 4 ft (1.2 m)
Plenum Length – 4 ft (1.2 m) 1 – 439839 1W
(Vertical Protection) Width – 4 ft (1.2 m)
Fryer (Split or Maximum Size
Non-Split Vat) (without drip board)
14 in. (355 mm) x
15 in. (381 mm) 1 13 – 16 in. 439845 290
Low Proximity (330 – 406 mm)
Fryer (Split or Maximum Size
Non-Split Vat) (without drip board)
14 1/2 in. (368 mm) x
14 in. (355 mm) 1 16 – 27 in. 439845 290
Medium Proximity (406 – 685 mm)
Fryer (Split or Maximum Size
Non-Split Vat)* (without drip board)
15 in. (381 mm) x
14 in. (355 mm)
High Proximity 1 27 – 47 in. 439842 230
Medium Proximity 1 20 – 27 in. 439843 245
Fryer (Non-Split Vat Only) Maximum Size
(without drip board)
19 1/2 in. (495 mm) x
19 in. (482 mm)
High Proximity 1 21 – 34 in. 439841 3N
Low Proximity 1 13 – 16 in. 439845 290
Maximum Size
(without drip board)
18 in. (457 mm)
x 18 in. (457 mm)
High Proximity 1 25 – 35 in. 439841 3N
(635 – 889 mm)
* For multiple nozzle protection of single fryers, see detailed information on Pages 4-10 and 4-11.
SECTION 4 – SYSTEM DESIGN
UL EX3470 ULC EX3470
PAGE 4-28 REV. 11 2014-SEP-01
R-102 Restaurant Fire Suppression Manual
NOTICE
This chart is for general reference only. See
complete details for each type of hazard.
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