revolvingdoor

A revolving door is a type of interior door consisting of multiple door wings mounted on a central axis that rotates within a cylindrical pocket. As the unit turns, individual compartments move past a doorway opening, allowing people to pass through while minimizing drafts and the exchange of air between interior and exterior spaces. This design helps maintain climate control and can support higher energy efficiency in large buildings.

Construction and operation typically involve three or four panels framed in metal or wood with glass infill. The door may be operated manually or powered by a motor. Modern models include safety features such as speed control, motion sensors to stop rotation if a person is trapped, and emergency stops. Some configurations incorporate breakaway sections to reduce injury risk, and many jurisdictions require an accompanying accessible door to meet accessibility standards.

History and usage: The revolving door design was patented by Theophilus Van Kannel in 1888 as a means to reduce air infiltration and improve comfort in crowded buildings. It became common in office towers, hotels, banks, and airports. Variants include partially enclosed models and those with insulated glazing, chosen for durability and energy performance as well as aesthetic appeal.

Metaphorical use: The term revolving door is frequently used to describe the movement of personnel between government or regulatory agencies and private sector roles. In political and media discourse, it can imply potential conflicts of interest or undue influence from lobbying, though it is also used descriptively to denote frequent personnel turnover.

Safety and accessibility considerations: While efficient, revolving doors can pose challenges for wheelchair users or people with mobility impairments. Many buildings install a separate accessible entry or an adjacent automatic door to ensure compliant access. Regular maintenance is important to preserve safety and performance.