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Good night's sleep rule
(sh.itjust.works)
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I think you misread my comment. I wasn't talking about closing vents attached to a blower
What other vents could you possibly be talking about if not hvac vents?
Vents that they used to put in ceilings in houses in Australia to ensure there was good air exchange between the inside and outside. They vent indoor air to roof space.
They seem to have come from architects who lived in places without winter