The Reliable Automatic Sprinkler Co., Inc.,
103 Fairview Park Drive, Elmsford, New York 10523
Bulletin 909
Bulletin 909
Model N25 (SIN RA0912)
Early Suppression
Fast Response Sprinkler
Product Description
The Reliable Model N25 Early Suppression Fast Re-
sponse Sprinkler (ESFR/Quick Response Storage Sprin-
kler) is intended for use against severe fire challenges.
This sprinkler is designed to respond quickly to growing
fires and will deliver a heavy water discharge to “sup-
press” rather than “control.”
Note:
The Model N25 ESFR sprinkler utilizes a levered
fusible alloy solder link in either a 165°F (74°C) or a
212°F (100°C) rating. FM Global considers this a “Quick
Response” storage sprinkler for use per FM Data Sheet
8-9.
The sprinkler has a Nominal K Factor of 25.2 (metric
362) and will deliver approximately 98 gpm (371 L/min)
of water at 15 psi (1 bar).
The smaller deflector and frame provide a broad, very
symmetrical, hemispherical pattern capable of sup-
pressing fires between sprinklers in high storage height
areas and at the same time retaining a high momentum
central core to penetrate and suppress fires occurring
directly beneath the sprinkler in low storage height ar-
eas.
The N25 ESFR sprinkler is also less susceptible to
damage due to smaller deflector and frame design. The
lighter N25 ESFR passed rough use and abuse test in
the labs without plastic protectors.
Application and Installation
The Model N25 is an ESFR sprinkler is intended for
installation in accordance with NFPA 13 and is a QR
Storage Sprinkler for use in all FM Loss Prevention Data
Sheets as well as approval of the Authority Having Ju-
risdiction.
The Model N25 ESFR sprinkler is designed for ceiling
only sprinkler system with no in-rack sprinklers required.
Protection of (but not limited to) most encapsulated or
non-encapsulated (including cartoned unexpanded)
plastics. Model N25 ESFR is also use for protection of
cartoned exposed expanded plastics as well as some
storage arrangements of rubber tires, rolled paper, and
aerosols.
Model N25 ESFR Sprinkler
Design Criteria
General guidelines:
Sprinkler Position:
Pendent, align frame arms with
the pipe. Deflectors should be parallel with the ceil-
ing or roof.
System Type:
Wet Pipe Systems Only
Maximum area of coverage:
100 ft
2
(9.3m
2
), greater
coverage area are allowable in some cases.
Minimum area of coverage:
64 ft
2
(5.8m
2
)
Maximum slope ceiling:
2/12 pitch (9.5°)
Maximum spacing:
12 ft (3.7m) for building heights
up to 30 ft (9.1m) and 10 feet (3.1m) for building
heights greater than 30 ft (9.1m)
Minimum spacing:
8 feet (2.4m)
De
fl
ector distance from walls:
At least 4 inches
(102mm) from walls, and no more than one-half the
allowable distance permitted between sprinklers.
De
fl
ector to Top of Storage:
at least 36 in (914mm).
De
fl
ector to ceiling Distance:
6 - 18 in (152 -
457mm).
Center Line of Thermal Sensing
Element To Ceiling Distance:
4 - 17 in (101.6 -
425mm).
Listings and Approvals
1. FM Approved as a quick response storage sprinkler.