Passive venting device

A passive venting device for venting a building enclosure to an outside, the device comprising:

• a base member comprising (1) a vent structure for permitting gases to pass in and out of said building enclosure through an opening in a surface of said building enclosure and through said vent structure;
• (2) an attachment structure connected to said vent structure for attaching said device to said surface such that said opening is in fluid communication with said vent structure;
• and (3) a gas-permeable screen, said screen being sized, shaped and positioned to prevent objects from passing through said vent structure, said screen having an airflow-enhancing configuration for providing greater airflow area than screens of ordinary straight-line sloped configuration;
• and
• a cover member mountable to said base member so as to cover said vent structure and so as to permit the free flow of gas between the outside and the enclosure through said vent structure;
• wherein said gas-permeable screen is positioned such that, when said attachment structure is attached to said surface, all of said screen has a vertical displacement from said attachment structure.