Allertor Rotation Direction

[EL1998P71]

So park somewhere normal and walk to near the siren

[holler]

So it must be wired wrong, eh? It was still loud, but it didnt seem like 125 db, more like a model 5.

Is it normal for an Allertor to have a T-Bolt blower sound when its facing away, or is that because of the backwards chopper rotation?

A 3-phase-engine changes the direction if you swap 2 powerlines.

And a radial fan with one or more outputs works very inefficient because it depends on the centrifugal force.
A normal omnidirectional siren uses also an radial fan but since the sides are simply open, the rotating direction is not relevant.
Tests with the siren E57 prove that.

That's an E-57 though, not an ACA product. Both the stators and rotors are directional.