Fires in 'cabins' with only the smoke extraction ystem operating were studied. Cabins of length up to lOm, width up to 8m and height up to 5m, with d@erent ventilation conditions under a NFPA t-fire with a cut-off value of5 MW were investigated. Thefire environments due to all the four sets of slow, meduim, fast, and ultra fm P-fires were tested. i'bepre zone model FIREWND was selected as the simulation tool. The total number of simulations was 14,400, including four m k e exhaust rates. The time toflashover wascomputedfortwod@erent timesofoperation of t h e m k e extraction system. It is found that without operating the sprinkler system, Jlasbover would occur under many conditions with the time to JIashoverasfmas2oos.

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