this post was submitted on 14 Aug 2023
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What are all these revolving doors for? (feddit.de)
submitted 2 years ago by agrammatic@feddit.de to c/germany@feddit.de
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Never before in my life have I encountered revolving doors so often as in Germany, and every time I have to use one, I wonder what's exactly the point.

Any ideas? The only think I can think of is that they slow down people on purpose, for crowd control.

Likely also for energy efficiency, but then the double doors system that I'm use to seems more efficient and probably cheaper than revolving doors.

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[–] Meuzzin@lemmy.world 18 points 2 years ago (1 children)

Installer here. They are precisely for what the other commenter said, and for traffic control. Think of the large hoards of cattle, I mean people, that enter and exit large office buildings at the same times everyday. If they were normal swing doors, or automatic sliders, climate-control wouldn't be able to keep up, as the doors would be open the whole time.

[–] agrammatic@feddit.de 3 points 2 years ago (1 children)

Are they objectively more efficient than an airlock system like this, or is their popularity accidental?

I can imagine they are more expensive than a double door system.

[–] legofreak@feddit.de 10 points 2 years ago* (last edited 2 years ago) (1 children)

If you have a large stream of people constantly entering or leaving the building, both doors will be open all the time. In a rotating door, people can enter and exit simultaneously and constantly but you still have a working air lock that exchanges less air with the outside than a door that is open all the time.

[–] agrammatic@feddit.de 2 points 2 years ago

I see. Then it might be a factor of population density. Where I come from, there's way less people moving in and out per building, to put it simply.

That solves it for me.