Model N252 (SIN RA0852)
Nominal K-Factor = 25.2
An Extended Coverage Sprinkler for
Storage Applications

Model N252 (SIN RA0852)
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 and cartoned
expanded plastic commodities under ceilings up
to and including 35 feet (10.5 m) high. They may
be used to protect solid piled, palletized, shelf or
bin box and open frame rack storage.
2. Eliminates the need for in-rack sprinklers.*
3. Extended coverage, low pressure, and low flow
demand provides the opportunity to reduce:
• Labor
• Piping and fittings
• Fire pump size
• Tank size
4. 165 °F (74 °C) and 212 °F (100 °C) temperature
ratings.
5.Maximum deflector distance from ceiling is 12”
(305mm).
6. Patent Pending.
* See Design Criteria for details.
The Reliable Automatic Sprinkler Co., Inc. 103 Fairview Park Drive, Elmsford, New York, 10523
Bulletin 908 Rev. A
Listings and Approvals
FM Approved
N252 EC Pendent
Product Description
The Model N252 EC Pendent are Special Application
Control Mode 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 and
cartoned expanded plastics. The Model N252 EC
sprinklers offer maximum coverage areas up to 14 ft by
14 ft (196 ft2) as compared to ESFR or Standard
Coverage Control Mode or Control Mode Special
Application sprinklers with maximum coverage of 100
ft2 (9m2). This offers the advantage of decreasing the
number of required sprinklers, reducing labor and
material costs. The Model N252 EC Pendent Control
Mode Special Application Sprinklers is designed for
use in ceiling only sprinkler systems with no in-rack
sprinklers required.
Operation
The Reliable Model N252 Extended Coverage
Pendent Special Application Control Mode Storage
Sprinklers utilize a levered fusible alloy solder link.
When the rated temperature is reached, the solder
melts and the two link halves separate allowing
sprinkler to operate and water to flow.
Design Criteria for FM
Maximum
Building Height
Feet (m)
Maximum
Storage Height*
Feet (m)
Minimum
Pressure
Psi (bar)
Maximum
Spacing
Feet (m)
Design
Area
Ft2 (m2)
Hose Stream
Allowance
GPM (L/min)
Water
Supply
Duration
30 (9,1) 25+(7,6+) 30 (2.1) 14 x 14 (4,3 x 4,3) 1200 (110) 250 (950) 1 Hour
35 (10,5) 30+ (9,0+) 40 (2.8) 12 x 12 (3,6 x 3,6) 1200 (110) 250 (950) 1 Hour
* Storage must be a minimum of 3’ (0.9m) below the deflector