This yellow siren (or smokestack) is at that abandoned superfund chemical plant that I mentioned months ago in Lowell, NC. It is disturbing to think that such a small place would need a full on SIREN. Welllllllllll, they DID use formaldehyde and other nasty stuff there along with the following incidents:
1:formaldehyde spill in the late 1990s/early 2000s
2: Barrel fire in a filterpress that lit up some other tanks
3: ASBESTOS
4: LEAD PAINT
5: WWTP spill in 2019 (even though abandoned, due to vandals)
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Given that Sentry 3V8 is painted yellow, I would not be surprised that it was used as a Civil Defense siren rather than a ChemSpi (Chemical Spill) warning siren.
However most Civil Defense sirens were dual-tone (had two sets of opening on the rotor, such as 8/12 and 10/12), and AFAIK I think 3V8s were often 8-port.