I plan to build a passive solar, earth berm home
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I’m having trouble finding out how big (diameter) and length of the earth tube to ventilate a 1500 square foot home.
The home is open design with concrete floors and walls, with exterior insulated.
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While you are waiting for more input, you might want to read this thread:
https://www.greenbuildingadvisor.com/community/forum/gba-pro-help/37129/grid-house-needs-gaspairgasp
You also might want to read the Earth tube section of this article by Joe Lstiburek:
http://buildingscience.com/documents/insights/bsi-076-great-moments-in-building-science
Thomas,
Steve provided a link to an article by Joe Lstiburek about an earth tube failure. There are plenty of other failure stories out there -- so pay attention to these caution flags.
Here's a link to a recent GBA article on the topic: Do Earth Tubes Make Any Sense?