1. Fire Engineer, Arup Fire, 13 Fitzroy St., London, W1T 4BQ, U.K.
2. Professor, School of Engineering and Electronics, Univ. of Edinburgh, Alexander Graham Bell Building, The Kind’s Buildings, Edinburgh, Scotland, EH9 3JL, U.K. (corresponding author). E-mail: asif.usmani@ed.ac.uk
3. Senior Fire Engineer, Arup Fire, 901 Market St., San Francisco, CA 94103.
4. Associate Director, Fire Engineer, Arup Fire, 13 Fitzroy St., London, W1T 4BQ, U.K.
5. Professor, School of Engineering and Electronics, Univ. of Edinburgh, Alexander Graham Bell Building, The Kind’s Buildings, Edinburgh, Scotland, EH9 3JL, U.K.