This may surprise some: open in winter, closed in summer. Rationale: in
winter, warm air and it's humidity will move from the crawl space out. In
summer, closed vents will prevent warm air and it's humidity from moving into
the cooler space.

Ed

In article , "Joseph Meehan"
wrote:
They are their to reduce moisture. Moisture does not go away in the
winter. They should be open all year to prevent moisture build up and help
prevent mold and rot.


Thanks,

Ed

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Ed Siff Computing Consultant
Library Systems CB# 3946
Academic Affairs Libraries UNC-Chapel Hill
919.962.1288
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"Take me on a trip upon your magic swirlin' ship" -Dylan