Reliable Automatic Sprinkler Co., Inc.,
103 Fairview Park Drive, Elmsford, New York 10523
Model N252 EC Pendent for
Control Mode
Speci
fi
c Application (CMSA)
Bulletin 908
Rev
. E
Bulletin 908
Rev
. E
Model N252 (SIN RA0842)
Nominal K-Factor = 25.2
An Extended Coverage Sprinkler for
Storage Applications
Features
1. Approved by FM Global for the following storage
applications:
Class 1-4, cartoned unexpanded plastic commodi-
ties under ceilings up to and including 35 feet (10.7
m) high. They may be used to protect solid piled,
palletized, shelf or bin box and open frame rack
storage.*
2. For other storage commodities and storage ar-
rangements, see FM Global Data Sheets 8-9.
3. Approved for installation per NFPA 13 (2013) . For
storage commodities, arrangements, and design
criteria: see NFPA 13 chapter 21.
4. Eliminates the need for in-rack sprinklers.*
5. Extended coverage, low pressure, and low flow
demand provides the opportunity to reduce:
• Labor
• Piping and fittings
• Fire pump size
• Tank
size
6. 165 °F (74 °C) and 212 °F (100 °C) temperature
ratings.
7. Maximum deflector distance from ceiling is 13
1
/
2
”
(343mm). 12” (305mm) to center line of thermal ele-
ment.
8. This is a Quick Response CMSA sprinkler that
meets the requirements of IFC 2015 for the elimi-
nation of smoke/heat vents in storage occupan-
cies.
9. US Pat. No. 7,624,812
Other Patents Pending.
*
See Design Criteria for details, Tables 1 & 2.
N252 EC Pendent
Listings and Approvals
FM Approved as a storage sprinkler.
Product Description
The Model N252 EC Pendent are Control Mode Specific
Application Extended Coverage Sprinklers for Storage
Applications. This includes protection of the storage and
display of Class I through IV commodities encapsulated
or unencapsulated, cartoned unexpanded plastics. The
Model N252 EC sprinklers offer maximum coverage areas
up to 14 ft by 14 ft (196 ft
2
) as compared to ESFR or Stan-
dard Coverage Control Mode or Control Mode Specific
Application sprinklers with maximum coverage of 100 ft
2
(9m
2
). This offers the advantage of decreasing the number
of required sprinklers, reducing labor and material costs.
The Model N252 EC Pendent Control Mode Specific Appli-
cation Sprinklers is designed for use in ceiling only sprin-
kler systems with no in-rack sprinklers required.
Table 1: Design Criteria for FM Class 4 and Cartoned Unexpanded Plastics in Open Frame Racks
Maximum
Building Height
Feet (m)
Maximum
Storage Height*
Feet (m)
Minimum
Pressure
Psi (bar)
Maximum
Spacing
Feet (m)
Number of
Design
Sprinklers
Hose Stream
Allowance
GPM (L/min)
Water
Supply
Duration
25 (7,5)
20 (6,0)
25 (1.7)
14 x 14 (4,3 x 4,3)
6
250 (950)
1 Hour
30 (9,1)
25 (7,6)
30 (2.1)
14 x 14 (4,3 x 4,3)
6
250 (950)
1 Hour
35 (10,7)
30 (9,1)
40 (2.8)
12 x 12 (3,6 x 3,6)
8
250 (950)
1 Hour
*
Storage must be a minimum of 3’ (0.9m) below the deflector
