Canadian Politics Today

No, not the kind in the White House.

I was watching the excerpt from the Godfather where Don Cuneo gets shot in the revolving door, and tried to remember the last time I went through a revolving door. At one time they used to be everywhere, but today they seem to be disappearing from our city landscape. Yes, there are a few still remaining but in many buildings they have been replaced with standard doors. They were very practical in keeping hot/cold air from inside buildings escaping outdoors. In subway stations they also help in fighting that pressure balance when a train is leaving the station that either make a standard door very difficult to open, or else it opens by itself.

Your reference to air pressure changes is a very valid one. I can imagine if you have to sit in an office all day in a building with an air handling unit which heats/cools the building, and that air flow/pressure changes somewhat each time a door is opened could be a little stressful on the eardrums. As a sidebar to this issue, I used to have a business were we installed such units in buildings, houses/commercial, and this particular job we installed a roof top heat pump on a new gas station/convenience store. The architect apparently oversized the unit since as soon as we turned it on the standard hinged doors all opened up an inch or two, due to the air flow. OK don't tell anybody but we fixed the problem by carving the bottom out of a 24 beer pack and placing it in the intake of that unit. The doors all went closed and we headed home to figure out what to do with that beer.