What is this?

[AwakenedWarrior]

20160823_144020.jpg

This is attached to the ceiling in a NY subway, a floor above where the trains come into and out of the station. Anyone know what this is or might be?
I haven't seen any light come out of it as many times as I walked past it, so my guess is it is emitting some kind of a signal/frequency.

[Hervé]

The "Do not paint" seems to indicate some kind of smoke or particle detectors?

[Citizen No2]

Interesting.

Could be some sort of detector Herve, but they usually have grills in them, or cut-slots in the main body. The look of it very much reminds me of marine radar...... Or a microwave transmitter, but it is impossible to tell from looks alone. Your thoughts, AwakenedWarrior, about it being some sort of transmitter may hold value.


R

[Marikins]

This is a Wi-Fi and mobile phone antenna: https://commons.wikimedia.org/wiki/F...ity_subway.jpg

[DeDukshyn]

Posted by Hervé (here)
The "Do not paint" seems to indicate some kind of smoke or particle detectors?

Posted by Marikins (here)
This is a Wi-Fi and mobile phone antenna: https://commons.wikimedia.org/wiki/F...ity_subway.jpg

... In case the paint has lead or other metals - it could block the signal