Some recent Swedish data on compartment fires are reviewed. Measured burning rates were as high as 7.7 A-roten-ur-H kg/min where A is the opening area in square meter and H is its height in m. A conventional power law is shown to relate the burning rate and the measured external flame length as well as does an empirical proportionality. The corrections to be allowed in both methods for the burning within the compartment and for the effective origin of the flames are both somewhat uncertain.