Fire Penetration Test 3 : A test that measures the ability of a section of a roof to resist penetration by fire when the external surface is exposed to heat and flame
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}