Upgrindly™ on Instagram: "Watch the precise, essential process of replacing a fire sprinkler head. Sprinklers rely on a small glass bulb or fusible link containing a liquid that expands or melts at a specific high temperature, triggering the system. This replacement showcases crucial technology and safety knowledge. Proper maintenance prevents system failure, which is a critical fact in fire history and safety regulations. Did you know that only the sprinkler closest to the fire activates, not t