Technical
Data
Sprinkler Identification Number
SIN C9226
Approvals
UL and C-UL Listed.
FM Approved.
(Listings and approvals only apply to
the service conditions indicated in
the Design Criteria section.)
Maximum Working Pressure
175 psi (12,1 bar)
Pipe Thread Connection
1 inch NPT or ISO 7-R1
Discharge Coefficient
K = 25.2 GPM/psi
1/2
(362,9 LPM/bar
1/2
)
Temperature Ratings
165°F/74°C or 214°F/101°C
Finish
Natural Brass
Physical Characteristics
The Model K25-1 utilizes a dezincifi-
cation resistant bronze alloy frame.
The strut and hook are monel; and,
the button, deflector, and compres-
sion screw are bronze. The frame ori-
fice is sealed with a gasketed spring
plate (Belleville Seal) consisting of a
beryllium nickel disc spring that is
sealed on both its inside and outside
edges with a Teflon
gasket, and the
two halves of the fusible link assem-
bly are nickel.
Design
Criteria
UL and C-UL Listing Criteria
The Model K25-1 Sprinklers are UL
and C-UL Listed as “Early Suppres-
sion Fast Response Sprinklers” for
installation per NFPA 13 or other ap-
plicable NFPA standards.
UL and C-UL Specific
Application Listing Criteria
The Model K25-1 Sprinklers are UL
and C-UL Listed as “Specific Applica-
tion Early Suppression Fast Re-
sponse Sprinklers” for use in in ac-
cordance with NFPA 13 to protect
single-, double-, and multiple row
rack storage and palletized and solid
pile storage (no open containers or
solid shelves) of Class I, II, III, and
IV commodities encapsulated or un-
encapsulated and cartoned Group A
unexpanded plastics when installed
with the following storage and ceiling
heights and minimum design pres-
sures:
Maximum Maximum
Minimum
Storage
Ceiling
Flowing
Height,
Height,
Pressure,
Ft. (m)
Ft. (m)
psi (bar)
40 (12,2)
45 (13,7)
40 (2,7)
35 (10,7)
40 (12,2)
25 (1,7)
30 (9,1)
35 (10,7)
20 (1,4)
25 (7,6)
30 (9,1)
15 (1,0)
When applying the specific applica-
tion listing criteria, the Model K25-1
Sprinklers should be installed using
the same installation obstruction and
construction criteria, as well as de-
flector-to ceiling distances, as is ap-
plicable for Early Suppression Fast
Response Sprinklers having a nomi-
nal K-Factor of 25.2 per NFPA 13.
FM Approval Criteria
The Model K25-1 Sprinklers are FM
Approved as “Early Suppression
Fast Response Sprinklers” for instal-
lation per the applicable FM Loss
Prevention Data Sheets.
Figure 1
Model K25-1 ESFR Pendent Sprinkler
1" NPT
(BOTH SIDES)
WRENCH FLAT
(96.8 mm)
3-13/16"
9/16" (14.3 mm)
NOMINAL MAKE-IN
2" (50.8 mm)
TEMPERATURE
RATING
ASSEMBLY
LINK
HOOK
†
Dupo
nt
Re
gi
ster
ed
T
rademar
k
OBSOLETE
