Editing Revolving door (section)

== Construction ==
[[File:Revolving door plan view.svg|thumb|Diagram of a revolving door, viewed from above]]
Around the central shaft of the revolving door, there are usually three or four panels called ''wings'' or ''leaves''.  Large diameter revolving doors can accommodate pushchairs and wheeled luggage racks - such large capacity doors are sometimes H-shaped to split the circle into only two (hence larger) parts.

Some revolving door displays incorporate a small glass enclosure, permitting small objects such as sculpture, fashion [[mannequins]], or plants to be displayed to pedestrians passing through. Such enclosures can either be mounted at the central pivot, or attached to the revolving door wings.

The wings of revolving doors usually incorporate glass, to allow people to see and anticipate each other while passing through the door.  Manual revolving doors rotate with pushbars, causing all wings to rotate. Revolving doors typically have a "speed control" ([[governor (device)|governor]]) to prevent people from spinning the doors too fast.

Automatic revolving doors are powered above/below the central shaft, or along the perimeter.  Automatic revolving doors have safety sensors, but there has been at least one fatality recorded.<ref>{{cite web|url=http://www.mori.co.jp/apology/en_040328.html  |title=About automatic door accident at Roppongi Hills - MORI BUILDING |access-date=2009-07-08 |archive-url = https://web.archive.org/web/20080126101814/http://www.mori.co.jp/apology/en_040328.html |archive-date = 2008-01-26}}</ref>

[[Skyscraper]] design requires a means of draft block, such as revolving doors, to prevent the [[chimney effect]] of the tall structure from sucking in air at high speed at the base and ejecting it through vents in the roof while the building is being heated, or sucking in air through the vents and ejecting it through the doors while being cooled, both effects due to convection. Modern revolving doors permit the individual doors of the assembly to be unlocked from the central shaft to permit free flowing traffic in both directions.  This feature, called ''breakout'' or ''break away'', is typically used only during emergencies, or to admit oversize objects.  The most effective method for this is the "bookfold" design, which allows all three or four wings to be broken away together.  Normally, the revolving door is always closed so that wind and drafts cannot blow into the building, to efficiently minimize [[HVAC|heating and air conditioning]] loads.

In [[right-hand traffic]] countries, revolving doors typically revolve counter-clockwise (as seen from above), allowing people to enter and exit only on the right side of the door.  In [[left-hand traffic]] countries such as Australia and New Zealand,<ref>{{cite web|url=http://www.brianlucas.ca/roadside/|title=Roadside|date=5 August 2013 |publisher=brianlucas.ca}}</ref> revolving doors revolve clockwise,<ref>{{cite web|url=http://www.pond5.com/stock-footage/552129/men-walk-out-of-the-australia-stock-exchange-building.html | title=Men walk out of the Australia Stock Exchange|publisher=pond5.com}}</ref> but door rotations are mixed in Britain.<ref>{{cite web|url=http://www.brianlucas.ca/roadside/ |title=Which side of the road do they drive on? |publisher=Brianlucas.ca |access-date=2009-07-08}}</ref>  Direction of rotation is often enforced by the door governor mechanism, or by the orientation of the door seal brush (weatherstrips).