| http://www.w3.org/ns/prov#value | - Thus, the negative pressure developed by the fan 22 in the rear panel hollow space draws the flow of air, fumes, or other noxious gases in the enclosed work space through the egress openings 23 in the rear panel, through the interior hollow space of the rear panel, and out through the outlet opening 20 for evacuation by the fan 22 to a benign discharge area.
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