Fire sprinkler
Operation
Columns: Maximum Ceiling Temperature | Temperature Rating | Temperature Classification | Color Code (with Fusible Link) | Glass Bulb Color
100°F / 38°C | 135-170°F / 57-77°C | Ordinary | Uncolored or Black | Orange (135°F) or Red (155°F) | 150°F / 66°C | 175-225°F / 79-107°C | Intermediate | White | Yellow (175°F) or Green (200°F) | 225°F / 107°C | 250-300°F / 121-149°C | High | Blue | Blue | 300°F / 149°C | 325-375°F / 163-191°C | Extra High | Red | Purple | 375°F / 191°C | 400-475°F / 204-246°C | Very Extra High | Green | Black | 475°F / 246°C | 500-575°F / 260-302°C | Ultra High | Orange | Black | 625°F / 329°C | 650°F / 343°C | Ultra High | Orange | Black