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this post was submitted on 04 Apr 2024
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Asklemmy
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Mathias Wandel on YouTube made some good videos a few years ago about maximizing airflow through a house with fans. One big finding was that rather than having a fan directly in a window or door pointing out it is actually best to have it a few meters away and directed at the opening. That allows the fan's airstream pull in and start moving much more air in the room out the opening. He used strips of paper hanging in doorways around the house and also I think took anemometer readings to get good measures of the airflow.
I think the general theory is to run the fans starting in the evening once the air temp outside is lower than inside, then close up the house in the morning to trap the cool overnight air?
https://youtu.be/1L2ef1CP-yw?si=aLTlAMKv_3p3ri2q I think he may have made multiple videos on the topic
Yeah that was really fascinating
You'll see this sort of thing in action when firefighters are ventilating a house with fans. They'll move the fans back until the air stream covers the entire opening it's aimed at. Any less and the spots the air stream doesn't hit are gonna have air flowing the wrong way.
A good trick I've found is that fans in long hallways are markedly more effective than pretty much anywhere else.