GLT-299-7-2(3) Rev.0
Jun 12, 2018
6
8.2.1
Spacing of Heat Detectors
Spot type heat detector spacing is based on detector installation on a flat smooth ceiling at 3 m (10 ft.) high. Spacing
of spot type detector is shown in Figure 2. The coverage area of a detector is represented as a square. Actual
detector coverage covers a circle whose radius is 0.7 times the listed spacing. Since all of the area within the
detector’s circle of coverage is suitable for detecting a fire, the shape and dimensions of the detector coverage
“square” in Figure 3 may be modified. Coverage area should remain within the overall detector circle of coverage as
shown in Figure 4.
(1) Heat detector; S = Listed spacing between detectors
Figure 2: Listed heat detector spacing
