Air Gap 2 : (1) A gap cut in the iron core of a choke or transformer to minimise the variation of inductance with current. (2) A space between panels or sheets of material which assists in thermal insulation (q. v.
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}