duct & return leakage
for some reason my post with this link doesn't
so trying again.
I often write in my posts about 30% duct/return
leakage, based on my experience & testing of
new & existing duct systems.
this is a very comprehensive post about just
really good blog for those who like to learn
how houses work. subscribe and/or read more
postings by clicking on titles of postings to
right of page.