Yep! This school had these as the main alarms throughout the building, but in 2007-2008, the horns were disabled due to a fire alarm system upgrade (they now have a Notifier ONYX NFS-3030 voice-evac system) and were painted over, except in the gym. I guess they found them too difficult to remove or something (likewise the school bells, as most of them are also disabled.) They also removed the original Gamewell pull stations.
It’s a good thing I didn’t go here for junior high school, like my parents did. The Federal Signal horns at East Middle School were bad enough!