28 Feb '12, 5am

Stack effect discussion #green

I find it interesting and a little frustruting that in all the discussion on stack effect I have not been able to find one article discussing the contribution of leaky ducts located in attics to stack effect. I have a home owner who reported excessive dust in her home. She lives in a 22 year old two story home in central California built before the requirement for sealed ducts. I noticed she had about 12 can lights in the ceiling of the upstairs rooms which were not air tight and with the other typical air leaks inthe upper portion of the shell of her home I suspected some duct leaks. She has 3 HAVC systems all with ducts in the attic and in portions of the interior walls. Testing the duct systems I found her duct leaks averaged 21% of nominal air flow which is fairly typical of some 22 year old homes here in the Valley. She has a natural draft fireplace on the first floor...

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

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