to catch smokers or vapers. That’s the part worth untangling. Some hotels do install dedicated vaping sensors, which are separate from the ceiling speakers used for announcements. Smoke alarms, however, can combine smoke detection with an audible alarm in a single unit, so they should not be grouped with vaping sensors as one device type. Don’t fold the two together just because both live on the ceiling.
The fun guesses in comment threads are entertaining, but they’re guesses. A speaker grille is a speaker grille.
speaker
source: SHIELD
How to
