Design
Criteria
The Model WS Window Sprinklers are listed by UL and C-UL, and
NYC Approved (MEA 191-96-E) for use as a "Specific Application
Window Sprinkler" and as open sprinklers for "Outside" use.
These sprinklers are also recognized by the National Evaluation
Service Inc. (NES), ICBO Evaluation Service, Inc. (ICBO ES), and
Underwriters Labratories of Canada (ULC) as providing a two-
hour equivalency for a fire separation assembly, when installed in
accordance with the NES Report (NER 516), ICBO Evaluation
Service Report (ER 5790), and ULC/ORD-C263.1 Appendix A.
Note
NER 516 can be obtained at www.nateval.org. ER 5790 can be
obtained at www.icbo.org. ULC/ORD-C263.1 Appendix A can be
obtained by contacting Technical Services.
Area of Use: When acceptable to the Authority Having Jurisdic-
tion and unless modified by one of the reports mentioned above,
the Model WS Specific Application Window Sprinklers may be
used in either a sprinklered or unsprinklered building to protect
nonoperable window openings that are part of a fire separation
provided:
a) in an interior fire separation, the window sprinklers are installed
on both sides of the window in the fire separation. (Ref. Figure A)
b) 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 building (Ref.
Figure B), or
c) in jurisdictions where exterior spatial separation is defined as
protecting your building from a fire in an adjacent building, open
window sprinklers are installed on the exterior side of the building
(Ref. Figure C).
System Type:
Interior Protection - Wet Systems.
Outside Exposure Protection - Deluge.
Glass Type: Non Opererable Heat-strengthened, Tempered, or
stronger glass window assemblies that are a minimum 1/4"
(6 mm) thick.
Type of Window Frame/Mullion: Noncombustible Frame with a
standard EPDM rubber gasket seal. Vertical joints of glass panes
must be connected by butt-joints sealed with a silicone sealant
between the individual panes or by Noncombustible Mullions (Ref.
Figure D & E)
Maximum Length of Window Assembly: Unlimited
Maximum Height of Window Assembly:
13' (3,96 m) (Ref. Figure G & H)
Maximum Distance Between Window Sprinklers:
8' (2,44 m) (Ref. Figure D & E)
Minimum Distance Between Window Sprinklers:
6' (1,83 m) (Ref. Figure D & E), unless separated by a baffle or
mullion of sufficiant depth to act as a baffle. (A mullion will act as a
baffle, when in the case of the Pendent Vertical Sidewall, the
mullion extends to the back of the sprinkler deflector, and in the
case of the Horizontal Sidewall, the mullion extends to the
sprinkler wrench flat)
Minimum Distance from Standard Sprinklers:
6' (1,83 m) unless separated by a baffle.
Sprinkler Location:
Mullioned Glazing Assemblies - Locate window sprinklers within
each mullioned glazing segment. (Ref. Figure D)
Butt Jointed Glazing Assemblies - Locate window sprinklers on
maximum 8' (2,44 m) centers. (Ref. Figure E)
Maximum Distance from Vertical Mullion:
4' (1,22 m). (Ref. Figure D)
Minimum Distance from Vertical Mullion:
4" (101,6 mm). (Ref. Figure D)
Intermediate Horizontal Mullions: Intermediate Horizontal
Mullions were not tested with the window sprinkler. Their use is
outside the scope of the "Specific Application" Listing for the
window sprinklers. (Ref. Figure F)
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.
Horizontal Sidewall - Locate within the outside edge of the window
frame from 1/2" to 4" (12,7 mm to 101,6 mm) away from the glass
and 2"
±
1" (50,8 mm
±
25,4 mm) down from the top of exposed
glass. (Ref. Figure G)
Pendent Vertical Sidewall - Locate 4" to 12" (101,6 mm to 304,8
mm) from the face of the glass and 3"
±
1" (76,2 mm
±
25,4 mm)
down from the top of exposed glass. (Ref. Figure H)
Minimum Clearance From Face of Glass to Combustible
Materials:
All combustible materials shall be kept 2" (50,8 mm) from the front
face of the glass. This can be accomplished by a 36" (914,4 mm)
pony wall or any other method acceptable to the Authority Having
Jurisdiction.
Escutcheon Assemblies:
The window sprinklers can be used with any metalic flush or
extended escutcheon, provided the dimensions from the sprinkler
deflector to the window frame and glass surface as specified in
this data sheet are maintained. These sprinklers are not listed for
recessed applications.
Recommended Hydraulic Requirements: The Authority Having
Jurisdiction should be consulted to determine the hydraulic
requirements for each installation.
Interior Protection Sprinklered Building - Identify which compart-
mented area has the most hydraulically demanding window
sprinklers. Calculate all of the sprinklers within a compartmented
area or the number of window sprinklers required to cover a
combined linear length of glass equal to 1.2 x the square root of
the system area of operation, whichever is greater. For example if
the building design area is 1500 ft
2
then 1.2 x (1500 ft
2
)
1/2
= 46.5
linear feet of glass or 1.2 x (139 m
2
)
1/2
= 14,2 linear meters of
glass. Add the window sprinkler demand to your most demanding
hydraulic design area.
Interior Protection Non-Sprinklered - Calculate all the sprinklers on
the most demanding side of the glazing assembly within the
enclosure.
Exterior Exposure Protection - Calculate all sprinklers controlled by
the deluge valve using the design requirements of NFPA.
Duration of Water Supply: The duration of the water supply must
comply with the requirements of NFPA. In the event the window
sprinklers are being 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:
Maximum Pressure Per Sprinkler:
Horizontal Sidewall = *70 psi (4,83 bar)
Vertical Sidewall = 175 psi (12,07 bar)
* The 70 psi is only for cold solder purposes. If there is a baffle or
mullion of sufficient depth to act as a baffle, separating the
sprinklers, the maximum pressure is 175 psi.
Minimum
Spacing Flow/Pressure
6' to 8' 20.0 gpm / 12.7 psi
(1,83 m to 2,44 m) 75,7 Lpm / 0,88 bar
Less than 6' 15.0 gpm / 7.0 psi
(1,83 m) 56,8 Lpm / 0,48 bar
OBSOLETE
