No matter you get the air pressure difference, the wall must have holes
for the air to pass through. They can be either random or deliberate.
Yes, I suppose the deliberate holes can be microscopic with some sort of
biological approach.
So, my point is this: use a fan, and use deliberate holes. In other
words, think out what you are doing, and understand the consequences.
Don't just say "let the house breath." I'm sure we would all
agree—planning for air movement is better thaan not planning and leaving
everything up to chance.
I have no problem with innovative ideas. That's great. What I object to
are the folks who think you get an air exchange magically just becaues a
house breathes naturally. Some specific physical mechanisms are involved
for air to move from here to there, and they can't be ignored.
By the way, on wood vs. plastic cutting boards, the current research
says they perform similarly.
-- John Bower, The Healthy House Institute http://www.hhinst.com/ email: healthy@bloomington.in.us 430 N. Sewell Road, Bloomington, IN 47408 Phone/fax 812-332-5073 __________________________________________________________________ This greenbuilding dialogue is sponsored by Oikos (www.oikos.com) and Environmental Building News (www.ebuild.com). For instructions send e-mail to greenbuilding-request@crest.org. __________________________________________________________________