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A revolving door saves energy by making sure that the inside of the building is never directly open to the exterior. Doors are built in a way that the path of air is always blocked no matter where the door turns.

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Study found that if everyone use revolving doors on camps buildings it would save about 1.5 percent of the total energy needed to cool and heat that building annually.

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https://en.wikipedia.org/wiki/Revolving_door

https://internationalrevolvingdoor.com/about/our-history

https://www.sciencedirect.com/topics/computer-science/revolving-door

https://pabook.libraries.psu.edu/literary-cultural-heritage-map-pa/feature-articles/round-and-round-revolving-door

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Revolving doors consist of three or four leaves centered on a central pivoting shaft that has a vertical axis.

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They facilitate rapid movement of people in and out of the building while keeping cold winds out of the warm interior space.

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On August 7, 1888 Theophilus Van Kannel was awarded a patent on his design, beginning a prosperous career. With his design finalized in 1888, Theophuilus Van Kannel's revolving doors began springing up throughout the Philadelphia area.

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Van Kannel’s alternative came in 1888, with a design he referred to as the “New Revolving Storm Door.”

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The cause for Theophilus Van Kannel to invent the revolving door was to prevent cold air, rain, dust etc to come inside the building when people walk in and out the Building main doors.

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The Revolving Door: Where did it come from? | Stuff of Genius

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Revolving Doors are an entrance to a large building in which four partitions turn about a central axis.

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In 1880 Theophilus Van Kannel invented The Revolving door. The design of the revolving door characterized the entrance of modern skyscrapers.