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10 D296/D297 Series Application Guide
6.6.3 Peaked Ceilings
Peaked structures follow the same
guidelines as sloped ceilings with one
exception: When calculating the
location of the detectors, the first
detector is within 3 ft (1 m) of the peak,
measured horizontally. Additional
detectors are spaced down from the
detector near the peak.
6.6.3 Long Ceilings
Long ceilings over 350 ft (107 m) require more than one set of detectors to cover the entire
length. To determine the number of detector sets required, divide the length of the ceiling by
350 (107 if using metric standards) and round up to the nearest number. Locate the detector
sets so that they cover an equal amount of area. Set the transmitters and receivers as
shown to the right and below to avoid possible “cross-talk.” The minimum spacing between
adjacent detectors is 1/10th of the distance between the transmitter and the receiver. For
example, for a beam length of 300 ft (91.5 m), the minimum spacing is 30 ft (9.1 m).
3 ft.
(1 m)
Max.
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