28 Jul '12, 6pm

Green Building Q&A: earth tube for make-up air

I am planing on building a very tight house. Before I ever heard of "earth tubes" I was planing on providing make-up air. About 90 feet from the home I am going to build an out building. On this outbuilding on an exterior wall i was going to build a box that would hold a furnace filter from which I was planning on using 6" s&d pipe to run down 8' into the ground & then over to the house from where it would come up into a chimney chase & ultimately exit at the top of the conditioned attic space. My thoughts: in winter the cold-make-up air would be tempered by going underground & dumping into the bottom of the chimney chase where it would get heated before exiting into the attic. In summer the hot-outside air could be cooled by passing underground & then dumping into the hottest part of the house at the highest point. An added benefit was being able to have filtered make-up ...

Full article: http://www.greenbuildingadvisor.com/community/forum/mecha...

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