Found an IRC-3 voice evac closeup video from 16 years ago
That just shows an IRC-3, not an IRC-3 system in action, & the OP already got what they were asking for, so I’m not sure your post was necessary.
What about the video of the pre-integrity speaker strobe going off at a church. The church there has 270-SPO’s, it could be an IRC-3 considering the whoop sounds different than a regular EST system.
Not sure I know that video but I suppose it could be an IRC-3 system, yeah.
it’s this one https://www.youtube.com/shorts/Ul973zXxLNY
Fire alarm could’ve been caused by incense, or someone had a candle too close to something.
Could have been, yeah. You might have actually found another system with an FS90 going by the sound of the whoop tone.