Numerical studies on impacts of vent location on building compartment fires under natural roof ventilation were
conducted. The results indicated that there was no significant difference of the smoke filling among compartment fires
with different vent locations. For compartment fire with a vent at the ceiling center, the oxygen concentration was much
larger, and the gas temperature was lower. The pressure difference of the center vented compartment fire was larger than
that of the corner vented fire, and the mass flow rate into the compartment was larger than out of the compartment from
the perspective of the whole burning stage. For the two scenarios, the mass flow rates of the center vented compartment
fire were much larger than that of the corner vented compartment fire. Cares should be taken when use the model for fires
directly under the ceiling vent.