| http://www.w3.org/ns/prov#value | - A vent for a crawl space type vent opening in the wall of a building, comprising: a front frame for engaging an outside face of the wall around the vent opening; a rear frame connectable to the front frame with one or more tension members adapted to extend through the opening, the rear frame including an outer portion for engaging an inside face of the wall around the vent opening, the one or more
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