Potter Fire Alarm Systems - Manual (Page 22)

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Fire Alarm Training • 8700055 • Rev F • 4/10
Heat Detectors
1. Heat detectors are not considered life safety equipment, they are for property protection only.
2. Heat detectors should be installed where conditions are not favorable for smoke detectors such as kitchens, garages, attics,
boiler rooms, etc.
3. The maximum ceiling temperature in the area where the heat detector is installed must be 20 degrees or more below the
operating temperature of the heat detector.
Ceiling Height
* Intended only for installation in controlled areas. Units shall be marked to indicate maximum ambient installation temperature
** Maximum ceiling temperature has to be 20 degrees Fahrenheit or more below the detector rated temperature.
Note: The difference between the detectors rated temperature and the maximum ambient ceiling temperature should be as small
as possible to minimize response time.
Above Up To Precent of
Listed Spacing
0 10 100%
10 12 91%
12 14 84%
14 16 77%
16 18 71%
18 20 64%
20 22 58%
22 24 52%
24 26 46%
26 28 40%
28 30 34%
Heat Detectors Only
Buildings with a ceiling height of 10 feet to 30 feet the heat detector spacing shall be reduced:
Heat Detector Selection Guide (from NFPA 72)
Temp Classification Temp Rating Range °F Max Ceiling Temp °F Color Code
Low* 100 - 134 20 Below** Uncolored
Ordinary 135 - 174 100 Uncolored
Intermediate 175 - 249 150 White
High 250 - 324 225 Blue
Extra High 325 - 399 300 Red
Very Extra High 400 - 499 375 Green
Ultra High 500 - 575 475 Orange