Alarms on TV/Movies

[system]

@Fire Alarm Fan

When Mike was in Pennsylvania at a coal processing plant and learns how to make coke, carbonized coal used to make iron which in turn is used to make steel, a U-HNH style horn can be heard when the oven is open.

It’s in the Parade Float Dismantler ep.

I’ve seen that one. It sounded like a lower pitched 450, probably sounding as a warning that the coal oven is open.