Pendent Fire Sprinkler Head, Quick Response, 3/4 in, 8.0 K, 155 deg F, Chrome

Reliable® models F1FR and F1FR 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 and F1FR recessed automatic sprinklers utilize a 3 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 and F1FR 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 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.

FM Approved|LPCB (UK)|NYC BS&A No. 587-75-SA|NYC MEA 258-93-E|UL Listed|ULC Listed