TFP621
Page 4 of 8
Minimum Distance from
Vertical Mullions
4 in. (101,6 mm)
(See Figure 4B-1)
Intermediate Horizontal Mullions
Intermediate Horizontal Mullions
were not tested with the Model CWS
Window Sprinkler. Their use is outside
the scope of the Specific Application
Listing for the window sprinklers. See
Figure 4B-3.
Deflector Location
Sprinkler Deflectors must be located as
described below in order to ensure that
the entire surface of the glass window
is covered. Sprinkler Deflectors are
positioned with respect to the window
frame, not the ceiling.
• Model CWS Window Sprinkler:
Locate 6 in. to 12 in. (152,4 mm to
304,8 mm) from the face of the glass
and 2 in. ± 2 in. (50,8 mm ± 50,8
mm) above the top of exposed glass.
See Figure 4C.
Minimum Clearance from Face of
Glass to Combustible Materials
For glass types other than FIRELITE
PLUS CWS ceramic glass by TGP, all
combustible materials shall be kept
2 in. (50,8 mm) from the front face of
the glass. This can be accomplished
by a minimum 36 in. (914,4 mm) pony
wall or other method acceptable to the
authority having jurisdiction.
Recommended Hydraulic
Requirements
The authority having jurisdiction should
be consulted to determine the hydraulic
requirements for each installation.
Interior Protection Sprinklered
Building
Identify which compartmented area
has the most hydraulically demanding
window sprinklers. Calculate up to the
most demanding 46.5 linear feet (14,2
linear meters) of Model CWS Window
Sprinkler on one side of the glazing.
The 46.5 linear feet (14,2 linear meters)
is based upon 1.2 x the square root of
the system area of operation, when the
system area of operation is 1500 sq.
ft in accordance with NFPA 13 Light/
Ordinary Hazard density curves.
Where the area of Glazing is less than
46.5 linear feet (14.2 linear meters), all
window sprinklers on one side shall be
calculated.
FIGURE 4A-1 - INTERIOR FIRE SEPARATION
FIGURE 4A-2 - EXTERIOR FIRE SEPARATION - SPRINKLERS INSIDE
FIGURE 4A (A-1 AND A-2)
TYPICAL NON-OPERABLE WINDOW OPENINGS
If an area reduction for quick response
sprinklers is utilized, the linear length of
the calculated window sprinklers may
be reduced, but in no case shall be less
than 36 linear feet (1.2 x
√
900).
If a single fire can be expected to
operate Model CWS Window Sprinkler
and sprinklers within the design area of
a hydraulically calculated system, the
water demand of the window sprinklers
shall be added to the water demand of
the hydraulic calculations and shall
be balanced to the calculated area
demand.
If the window sprinklers are located in
an area other than the hydraulic design
area, the demand of the window sprin-
klers is not required to be added to the
demand of the remote hydraulic design
area. However, it is necessary to prove
hydraulically the simultaneous opera-
tion of the Model CWS Window Sprin-
kler and the ceiling sprinklers adjacent
to the window sprinklers.
Interior Protection
Non-Sprinklered Building
Calculate all sprinklers on the most
demanding side of the glazing assem-
bly within the enclosure.
Duration of Water Supply
Duration of water supply must comply
with requirements of NFPA. If window
sprinklers are used to provide the
equivalency of a fire rating, the water
supply must be capable of supplying
water for the required rating period.
Minimum Flow per Sprinkler
20 GPM (75,7 LPM) for sprinkler
spacing of 6 ft to 8 ft (1,83 m to 2,44
m) or 15 GPM (56,8 LPM) for sprinkler
spacing less than 6 ft (1,83 m).
Maximum Pressure per Sprinkler
175 psi (12,07 bar)
INSIDE
INSIDE
When acceptable to the Authority Having Jurisdiction the Model CWS Specific Application
Window Sprinkler may be used in either a sprinklered or unsprinklered building to protect
nonoperable window openings that are in an interior fire separation, the window sprinklers
are installed on both sides of the window in the fire separation.
INSIDE
OUTSIDE
EXPOSURE
SIDE
When acceptable to the Authority Having Jurisdiction the Model CWS Specific Application
Window Sprinkler may be used in either a sprinklered or unsprinklered building to protect
nonoperable window openings that are part of a fire separation provided in jurisdictions
where exterior spatial separation is defined as protecting an adjacent building from a fire
in your building, window sprinklers are installed on the interior side of the glass.
