Although the aforementioned studies provide useful results, these results are also specific to the type of door which they were acquired for, namely 2m x 2m doors with four compartments.[17] Although it appears that these dimensions were standard for four-compartment doors at the time, this is not the case nowadays. A more recent experimental study[18][19][20] carried out at Imperial College London's Department of Civil and Environmental Engineering, has provided more insight into the flow physics by which air is transferred across a revolving door.