Location And Spacing; Ceilings; Flat Ceilings - Bosch D296 Application Manual

8 en | Document Introduction
Figure 3.3: Multiple-level Mounting
3.4

Location and Spacing

The D296/D297 detectors allow a range of 30 ft to 350 ft (9 m to 106 m) and spacing up to
60 ft (18.3 m). Space the detectors no more than 60 ft (18.3 m) between projected beams
and no more than half the spacing between a projected beam and a sidewall . You can
determine other spacing based on ceiling height, airflow characteristics, and response
requirements. In some cases, mount the transmitter on one end wall and mount the receiver
on the opposite wall. You can also mount the transmitter and receiver up to one-quarter of the
spacing distance from the end walls.
See the following figure:
Figure 3.4: Location and Spacing
3.5

Ceilings

3.5.1

Flat Ceilings

Flat‑ceiling Projected beam applications are those that have a flat, smooth ceiling with a
height of 12 ft (3.6 m) or lower and beam or solid joist depths of 1 ft (0.3 m) or less. Open
trusses less than 10% material and 90% open air do not affect the flow of smoke. Smooth flat
ceiling guidelines apply where the trusses are used.
2013.02 | 02 | F.01U.500.951
1 Multiple-level mounting locations
1 Transmitters (2)
2 Receivers (2)
S Selected detector spacing
Application Guide
Projected-beam Smoke Detectors
Bosch Security System, Inc.