Hi,

while I'm not sure, if it's wise + allowed to map emergency equipment of buildings at OSM, I guess it's possible. Rescue plans are obligatory here in Germany for any public building, so you might share this details also online, to teach visitors where they can leave the building, or get help for rescue:

• entrance=emergency
• emergency=defibrillator
• emergency=assembly_point
• emergency=landing_site
• emergency=dry_riser_inlet
• emergency=fire_alarm_box
• emergency=fire_extinguisher
• emergency=fire_hose
• emergency=fire_hydrant
• emergency=life_ring
• emergency=assembly_point

Maybe this should be a seperated layer to avoid visual overload?
There are maps like openfiremap.de or Wambacher's Emergency but usually this objects are outdoor.