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Fire sprinkler heads have different heat-sensitive elements and the two main options are a glass bulb and a fusible link fire sprinkler.
Know a Fire Sprinkler, Like a Boss – Part 1
Fire sprinkler systems
A Beginner's Guide: 5 Types of Fire Sprinkler Systems - KOB Fire
Everything you need to know about Fire sprinklers – Fire Fighter Industry
Know a Fire Sprinkler, Like a Boss – Part 1
Automatic Fire Sprinklers & their Operating Temperatures — Triangle Safety Consulting LLC
Fire sprinkler temperature ratings and color code table
The Difference Between a Glass Bulb and Fusible Link Fire Sprinkler ·
Everything you need to know about Fire sprinklers – Fire Fighter Industry
Fire System Engineering need to know how to system work in fire protection system.
Electric fire detection switches with thermal glass bulb or fusible link, wall mounting – JPC France