Bosch D296 - Plan for the effects of stratification in cold environments; Design for the expected fire load

Figure 3.6: Flat Ceiling - Example B
1 Transmitters (5) 3 Ceiling beams/joists (2)
2 Receivers (5)
Sloped Ceilings
Use the spacing for flat beamed ceilings in installations with beams running parallel to (up)
the slope. The ceiling height is the average height over the slope. For slopes greater than 10°,
detectors at half the spacing from the low end are not required. Spacing is measured along a
horizontal projection of the ceiling.
Use the spacing for flat beamed ceilings in installations with the beams running perpendicular
to (across) the slope. One set of beams must be within 3 ft (1 m) measured horizontally of the
high point of the ceiling. See the following figure:
Figure 3.7: Sloped Ceilings
1 Slope 10° or less 3 Slope greater than 10°
2 3 ft (1 m) maximum 4 Detector at ½ S not required
S Selected detector spacing
3.5.2
10 en | Document Introduction Projected-beam Smoke Detectors
2013.02 | 02 | F.01U.500.951 Application Guide Bosch Security System, Inc.