I have never seen this done in any of my schools and of all of them I think that my high school would have been the one to most likely do this. In my high school, there were alarms almost EVERYWHERE that wasn’t a large classroom or a bathroom. The former assessment center which was then used as a special education class had a 2DCD+AV32 combo that was so loud it made the computer screens in there stripe up vertically. I was in there two times when it went off and on the second time I was at the other end of the room and it was STILL loud. Also there was another 2DCD+AV32 combo in that area that was so loud you could hear it coming down the stairs. I wonder if it is better not since they were replaced with Siemens U-MMTs?
Then we have the 9838+4904s in areas that are very small and don’t need a horn at all like the small hallway to the counselor’s room, the nurses office and the school-to-career offices. Plus in a back stairwell, there was a HEAD LEVEL 9838+4904 on top of the exit from the Teen Center and just going down those stairs can be considered painful. God knows what students who evacuate from the Teen Center go through and if they lose their hearing.