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Old 12-10-2009, 08:03 PM   #7
Avalon Senior Member
Join Date: Dec 2008
Location: New Zealand
Posts: 992
Default Re: Building underground safe rooms

Have you heard of John Haitt and his Pahs system. This stands for passive annual heat storage. I reckon this system is one of the best. Its very simple and low imput. No heating necessary! As far as protection from solar flares/radiation goes, four foot of earth sheilding or is it concrete then four foot of earth? Not sure, but certainly underground!


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