Kidde Fire Protection 400 Series, Design, Installation, Operation, And Maintenance Manual

Page: 87 / 190

System Design
06-237518-001 3-21 July 2018
Figure 3-6. Nozzle Orientation
• Ceiling Clearance -Nozzles must be installed so that the orifices are located 6 to 12 in +/-
2 in (152 to 483mm +/- 51 mm) below the ceiling.
• Maximum Height -The maximum protected height for a single row of nozzles is 5 m (16.4
feet). Nozzles may be tiered to accommodate enclosures with ceiling heights greater than
5 m (16.4 feet), but no greater than 9.8 m (32 ft).
• Minimum Ceiling Height -The minimum ceiling height is 1 ft or 12 in (0.3 m).
• 180° Nozzles -180° nozzles must be located 6 +/- 2 inches (0.15 +/- 0.05 m) from
a wall, with the orifices directed away from the wall. The nozzle shall be located as
close to the center of the wall as possible, but at least 1/3 of the way along the wall.
180° nozzles have a maximum coverage area defined as a square that can be inscribed in
a semicircle of distance 39.8 ft (12.1 m, diagonal of a rectangle 17.8 ft x 35.6 ft). Refer to
Figure 3-5 for further information. 180° nozzles may be used in a back-to-back configura-
tion. The nozzles should be placed 1 to 2 ft (0.3 m to 0.6 m) apart.
• 360° Nozzles -360° nozzles must be located as close to the center of the enclosure
as possible. 360° nozzles have a maximum coverage area defined as any square that
can be inscribed in a circle of radius 25.2 ft (7.7 m, diagonal of a square 17.8 ft x 17.8
ft). Refer to Figure 3-5 for further information.
• Multiple Nozzles -Nozzles whose discharge patterns will intersect must be placed at least
10 ft (3.3 m) apart to assure adequate Agent distribution.
• Reduced Coverage Area -Consideration should be given to reducing nozzle spacing when
obstructions that would impede the uniform distribution of the Agent throughout the area
are present. Nozzle coverage area must be reduced to 25 ft x 25 ft for enclosure heights
six to twelve inches (7.5 m x 7.5 m for heights 0.15 to 0.3 meters).
Limits on Nozzle Conditions:
•
Minimum average nozzle pressure -The nozzle pressure must be a minimum of 12.9 bar
(188 psig) for the nozzle to effectively distribute the Agent and mix the Agent into the air
of the enclosure being protected.
Subfloor
Space
Pendant Nozzle Position
Upright Nozzle Position
Subfloor Tiles
Slab
Ceiling
Void or
Second
Tier
Min
305mm (1')
Pendant Nozzle Position Upright Nozzle Position
Max Height Limit
4.88m (16') or
less, but with
Physical Barrier
Slab
Min
305mm (1')