The Siren Board

I think I may have found an ACA screamer on a former firehouse in King of Prussia Pennsylvania.

I don't believe this siren has been greatly documented as far as I can tell.

I think that's just a vent for the building. If it is a Screamer, it would have to be very heavily modified, but I'm still pointing towards vent.

It's hard to tell. It is the correct size roughly, and there is a small electrical box looking object on the bottom of it, just like what an ACA screamer has. Plus it is on top of a fire department building. Catching a hint of it from the other side it may be a vent though. It just looks incredibly close to a screamer.

It's a vent. The cover is one single large piece, instead of the rainshield/skirt combo the Screamer has. There's also no visible chopper/stator assembly, and the "motor" doesn't fit the proportions of any Screamer model.

That doesn’t appear to be a siren. Looks like a vent.

The more I look at it the more it does look like a vent.

I won't leave you all empty handed though. There is a fairly undocumented and not previously mapped 3T22 at 17 Burnside Ave, Norristown, PA 19403, which is a ways to the northwest of this bust.