Models F1 Quick Response Series Sprinklers

Reliable Model F1FR series sprinklers are quick-response automatic sprinklers with a glass bulb thermal element. 
Model F1FR series sprinklers are Standard Spray sprinklers, with the exception of the Model F1FR56 Conventional sprinkler which is an Old-style/Conventional sprinkler.
The Model F1FR Series automatic sprinklers utilize a 3.0mm 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 Series sprinklers to apply water to a fire faster than standard-response 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.
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 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.

Model F1FR Series sprinklers provide a wide range of options where quick-response, glass bulb sprinklers are used:

• Pendent, recessed pendent, upright, horizontal sidewall and vertical sidewall deflectors
• K-factors of 2.8 (4.0 metric), 4.0 (5.7 metric),
• 4.2 (6.0 metric), and 5.6 (8.0 metric)
• Flush, recessed, and concealed installations