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The Reliable Automatic Sprinkler Co., Inc.,

 103 Fairview Park Drive, Elmsford, New York 10523

Model F1FR LO

K8.0 (115 metric) Quick 

Response Sprinklers

Model F1FR LO Sprinkler Types

Standard Spray Upright
Standard Spray Pendent
Conventional

Model F1FR LO Recessed Sprinkler Types

Recessed Standard Spray Pendent

For Model F1FR 

1

/

2

" K 5.6 (80), 4.2 (60) and 2.8 (40) Sprinkler 

Types refer to Bulletin 014 for technical specifications and 
approvals.

Listings and Approvals

1.  Listed by Underwriters Laboratories, Inc. (UL)
2.  Listed by Underwriters’ Laboratories of Canada (ULC)
3.  Factory Mutual Approvals (FM)
4.  Loss Prevention Council (LPCB, UK) 
5.  VdS Schadenverhütung GmbH
6.  EC Certificate:  1438-CPD-0049 (R3612) 

1438-CPD-0048 (R3622) 
1438-CPD-0047 (R3672)

UL Listing Category 

Sprinklers, Automatic and Open
Quick Response Sprinkler

ULGuide Number

VNIV 

Product Description

Reliable Models F1FR LO and F1FR LO Recessed Sprinklers 

are quick response sprinklers which combine the durability of a 
standard sprinkler with the attractive low profile of a decorative 
sprinkler.

The Models F1FR LO and F1FR LO Recessed automatic 

sprinklers utilize a 3.0 mm frangible glass bulb. These sprinklers 
have demonstrated response times in laboratory tests which 
are five to ten times faster than standard response sprinklers. 
This quick response enables the Model F1FR LO and F1FR LO 
Recessed sprinklers to apply water to a fire much faster than 
standard sprinklers of the same temperature rating.

The glass bulb consists of an accurately controlled amount of 

special fluid hermetically sealed inside a precisely manufactured 
glass capsule. This glass bulb is specially constructed to provide 
fast thermal response. The balance of parts are made of brass, 
copper and beryllium nickel.

At normal temperatures, the glass bulb contains the fluid in 

both the liquid and vapor phases. The vapor phase can be seen 
as a small bubble. As heat is applied, the liquid expands, forcing 

Upright

the bubble smaller and smaller as the liquid pressure increases. 
Continued heating forces the liquid to push out against the bulb, 
causing the glass to shatter, opening the waterway and allowing 
the deflector to distribute the discharging water.

The temperature rating of the sprinkler is identified by the 

color of the glass bulb.

Application

Quick response sprinklers are used in fixed fire protection 

systems: Wet, Dry, Deluge or Preaction. Care must be 
exercised that the orifice size, temperature rating, deflector 
style and sprinkler type are in accordance with the latest 
published standards of the National Fire Protection Association 
or the approving Authority Having Jurisdiction. Quick response 
sprinklers are intended for installation as specified in NFPA 13, 
FM Global Loss Prevention Data Sheet 2-8N or other applicable 
standards. Quick response sprinklers and standard response 
sprinklers should not be intermixed.

Installation

Quick response sprinklers are intended for installation as 

specified in NFPA 13, FM Global Loss Prevention Data Sheet 
2-8N or other applicable standards. Quick response sprinklers 
and standard response sprinklers should not be intermixed.

The Model F1FR LO Recessed Quick Response Sprinklers 

are to be installed as shown. The Model F1 or F2 Escutcheons 
illustrated are the only recessed escutcheons to be used with 
the Model F1FR LO Sprinklers. The use of any other recessed 
escutcheon will void all approvals and negate all warranties.

Pendent

Conventional

Recessed Pendent 

(Model FP Shown)

Multilingual document:  

Select your language below

Bulletin 136 Rev. T_Multilingual

Bulletin 136 Rev. T_Multilingual

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