Whilst airflows through swinging and sliding doors are well understood, the study of airflows arising from the use of revolving doors has so far largely been neglected. This study presents the findings of the first systematic investigation of airflows driven by revolving doors, with particular focus on the fundamental physical processes by which these flows occur. Results from a comprehensive experimental programme reveal that two distinct flow regimes are possible through any given revolving door. The regime achieved depends on whether airflows are either restricted by the time taken by air...