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Code requirements are always a compromise between what’s best and what’s practical
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If you know a little building science, you've no doubt seen a lot of problems that occur with air distribution systems. Ducts just don't get anywhere near the attention they deserve in most homes.
I've written about ducts quite a bit here and have shown problems resulting from poor design and installation. We all know how stupid some of those problems are. So today I'm going to talk about a problem that doesn't get nearly enough attention: duct insulation — even when the design and installation are perfect.
from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/r-8-duct-insulation-enough
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