What are the 5 Not-So-Obvious Benefits of Revolving Doors?

A little History of Revolving Doors

The revolving door was invented and patented by Theophilus Van Kannel of Philadelphia in 1888, according to Wikipedia. The world’s first revolving door was installed in a restaurant called  in New York’s Times Square 10 years later. Nowadays, it’s extremely popular all over the world.

The first revolving door ever in the world in Rector’s resturant
(Image from 99percentinvisible.org)

What usually a revolving door consists of?

A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. Large revolving door systems may have, in the central pivot, a small glass enclosure permitting the display of sculptures, mannequins, plants, and advertisements.

But exactly why is it that most of the big buildings all have revolving doors? After knowing all benefits of revolving doors, you will understand.

Revolving doors benefit 1: Energy Saving

Revolving doors serve as an airlock, which keeps cold air out, thereby reducing heating costs. Revolving doors cut off the air path between the outside of the building and the inside. In colder climates, the difference can be very large. Opening a hinged or sliding door even for a brief period will let out a tremendous amount of heat, which increases heating costs for the entire building. With a revolving door, this doesn’t happen as there is never a point where the air can flow freely between the conditioned (inside) and unconditioned space (outside). The reverse should be true in hot climates, where the goal is to keep in the cooled air.

A revolving door's typical structure
(Image from Wikipedia)

In 2006, an MIT research calculated that revolving doors exchange eight times less air than swinging doors, which can add up to thousands of dollars in wasted energy costs per building per year.

Revolving doors benefit 2: Traffic Control

Revolving doors can be used for security purposes, involving radiation detectors and metal detectors. In that way, they allow for better control of the interior environment when compared to regular automatic sliding or hinged doors. Revolving doors allow large numbers of people to pass in and out easily and quickly. Revolving doors permit people to be going in and out of the door at the same time.

Revolving doors benefit 3: Less Draft

Hinged or swinging doors can create the wind that might be strong enough to blow small objects away. Revolving doors prevent that strong draft smoothly compared to regular automatic sliding or hinged doors.

Revolving doors benefit 4: Reducing noise from outside

Most revolving doors can accommodate strollers and those wheeled luggage bags. Revolving doors block much street noise from entering a building. The noise created by a hinged door opening and closing is silenced. Car and bus fumes are locked out too.

Revolving doors benefit 5: Aesthetically Pleasing

Architects love revolving doors as they make a building more aesthetically pleasing due to the size of the doors. There is a psychological effect at work. The space between the panels of the revolving door is quite small. When a person steps out of the door, the room they are standing in automatically seems larger than it really is.

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