Silent Call 1008-4 - Manual (Page 21)

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DO NOT attach the detector to removable ceiling panels.
Attach the detector across panel support as shown in Figure 9.
Dust Covers are an effective way to limit the entry of dust into the
smoke detector sensing chamber during construction. However, they
may not completely prevent airborne dust particles from entering the
detector. Therefore, it is recommended that the detectors be removed
before beginning construction or other dust producing activity. When
returning the system to service, be sure to remove the dust covers from
any detectors that were left in place during construction.
Smoke detectors are not to be used with detector guards unless the
combination has been evaluated and found suitable for that purpose.
Figure 8: Detector Mounting Base
Figure 9: Mount Detector Across Ceiling Panel Support.