Comments by "" (@Green__one) on "Door closers: ubiquitous, yet unloved and often maladjusted" video.

  1. In terms of revolving doors, they are on their way out. The problems with wheelchairs, walkers, strollers, etc cause enough trouble, and there are more modern solutions to the problem. I've seen a lot of them recently replaced with air curtains on sliding doors. You also mentioned that you hadn't seen airlocks that forced you to wait for one door to close before the other would open. I actually have, at the zoo here, the penguin exhibit used to have revolving doors on each end to keep the cold air inside the exhibit. They have since replaced both revolving doors with proper airlocks where you have to wait for one door to close before the other will open. They hold about 20 people if you stand close together, and there are prominent emergency exit override buttons inside them. You also said you couldn't think of a reason to have the swing speed faster than the watch speed, I absolutely can. I can foresee lots of reasons why you would want the door to be closed as quick as possible, but also want as soft to touch as possible for noise mitigation. Your hotel is actually a perfect example where you want to close the door quickly for privacy, but you want to avoid slamming the door. So assuming the latch works smoothly, you can have the door move quickly through most of its swing but only slow down at the last moment to avoid the slam at the end.
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