General
Description
Exposure (Outside) Protection Sprin-
klers are utilized to provide protection
from exposure fires on the outside of
buildings . The Issue A and B Window
Type Exposure Protection Sprinklers
are intended for spraying water on win-
dow glazing at prescibed spacings and
sprinkler locations at a minimum dis-
charge pressure of 7 psi (0,48 bar).
The smaller orifice Issue A Sprinklers
are normally used where exposure is
light or moderate, the area of coverage
is small, or where one horizontal line
of window sprinklers is installed at
each floor. The larger orifice Issue B
Sprinklers are normally used where
exposure is severe, or where one hori-
zontal line of sprinklers is used to pro-
tect windows at more than one floor
level.
It is recommended that the end user be
consulted with respect to the suitability
of the materials of construction and
finish for any given corrosive environ-
ment. The effects of ambient tempera-
ture, concentration of chemicals, and
gas/chemical velocity, should be con-
sidered, at a minimum, along with the
corrosive nature to which the sprin-
klers may be exposed.
The Issue A and B Window Type Ex-
posure Protection Sprinklers are a re-
designation for the Gem Issue A and
B.
WARNINGS
The Issue A and B Window Type Ex-
posure Protection Sprinklers de-
scribed herein must be installed and
maintained in compliance with this
document, as well as with the applica-
ble standards of the National Fire Pro-
tection Association, in addition to the
standards of any other authorities hav-
ing jurisdiction. Failure to do so may
impair the performance of these de-
vices..
The owner is responsible for maintain-
ing their fire protection system and de-
vices in proper operating condition.
The installing contractor or sprinkler
manufacturer should be contacted
with any questions.
Page 1 of 4
TFP835
APRIL, 2006
Issue A and B
Exposure Protection Sprinklers,
Window Type
Technical Services: Tel: (800) 381-9312 / Fax: (800) 791-5500
IMPORTANT
Always refer to Technical Data
Sheet TFP700 for the “INSTALLER
WARNING” that provides cautions
with respect to handling and instal-
lation of sprinkler systems and com-
ponents. Improper handling and in-
stallation can permanently damage
a sprinkler system or its compo-
nents and cause the sprinkler to fail
to operate in a fire situation.
TABLE A
ISSUE A AND B WINDOW TYPE EXPOSURE PROTECTION SPRINKLERS
ORIFICE SIZES AND K-FACTORS
1/4"
3/8"
5/16"
2.62
4.08
1.83
58,73
37,72
26,33
(LPM /
bar)
ISO/SI
(GPM /
psi)
NFPA
ORIFICE
SIZE
K-FACTOR
TYPE
NOZZLE
ISSUE A
1/2"
3/4"
5/8"
8.64
12.39
5.76
178,39
124,39
82,93
ISSUE B
THREAD
3/4"
3/4"
1/2"
1/2"
1/2"
1/2"
SIZE
(NPT)