In the NIST full scale experiments a space was considered untenable when the temperature at 1.5 meters (5 feet) above the floor reached: 60C (140F) 100C (212F) 120C (250F) 200C (400F) 12. In the NIST un-sprinklered full scale experiment the event that caused conditions on the dance floor to rapidly deteriorate was the: ignition of the foam insulation. flashover of the drummers alcove. opening of the side entrance behind the stage. formation of a ceiling jet below the dance floor ceiling. 13. During a fire investigation the fire investigator should document a structure beyond the area of origin to include all door and window openings when: the fire results in significant damage there are egress issues related to incident there is an indication of full room involvement it is anticipated that fire modeling may be required 14. Collecting and preserving samples of unburned interior finish and other significant fuel packages will: not provide useful data from bench scale testing assist in the characterization of fuels for fire models assist in the determination of the use of accelerants provide useful information and data for fire modeling only