http://faq.gardenweb.com/faq/lists/...2739009975.html http://www.intl-light.com/handbook.html vent effi. loss http://www.freecalc.com/ductloss.htm peace moon/
ok lets try the garden web adress again it seems to work on diff. adresses dependin on wat site im at or home http://faq.gardenweb.com/faq/lists/organic/2002082739009975.html