Aero Fire Alarm System Trade : name A detector unit that actuates if heat expands the air in small tubes installed along ceilings and walls that lead to diaphragms in the detector unit
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}