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SUBJECT: RE: Ventless crawlspaces
FROM: DEAN YOUNGKEIT young@brigham.net
DATE: 11/10/1999 6:02:00 PM
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About 15 years ago, Popular Science magazine had an
article on a crawlspace + plenum for a downdraft
furnace. The foundation walls were well insulated and
the soil was sealed against radon gas with a concrete
slab over polyethyline. The benefits were ducting
savings and a warm floor
If an updraft furnace were used with vents at the
ceiling joint with the central plenum, the closed
crawlspace could be a cold air return plenum.
The venting requirement to prevent moisture
accumulation and rot is satisfied by either approach.

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