GBlist: Ventilation per John Bower/Ductwork

Tom Phillips (tphillip@arb.ca.gov)
Wed, 19 Mar 1997 11:37:45 -0800

Hal wrote:
Metal products (including some ductwork, I suspect) are often coated
albeit thinly with oil. This can result in more rapid accumulation of
particles which in turn can act hygroscopically and serve as nutrients
for
microbial contaminants. When you buy aluminum foil, one side is shiny
and
one is dull. I believe the shiny side is coated with oil.

BTW, your suspicion re: oil in ducts was confirmed by Scandinavian study
a few years ago (Indoor Air Proceedings? Indoor Air?) -- they found that
mold could grow on this surface. They recommnending cleaning the duct
interior of oil (rom the mfg. process) before installing the ductwork.

-- 
Thomas J. Phillips                             AIR     {)   FOOD
Air Pollution Research Specialist                      /|\	
CARB/RD, Box 2815, Sacramento, CA 95812        WATER    |    SKIN
916.322.7145/4357 FAX, http://www.arb.ca.gov          _/ \_
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