Passive venting device

A passive venting device for a building enclosure comprising:

• a base member having an outer flange for securing said base member in position to cover an opening in a surface of said building enclosure;
• a vent structure associated with said base member for permitting gases and vapors to pass through said base member;
• and
• a one piece cap member uncloseably mounted to said base member and spaced therefrom sufficiently to permit the free flow of air between said one piece cap member and said base member and through said vent structure;
• at least one piece cap member being composed of a translucent plastic containing an additive for inhibiting discoloration, said additive being present in an amount sufficient to inhibit discoloration without reducing the light transmissive efficiency of the plastic by more than 50% of the light transmissive efficiency of said translucent plastic in the absence of the additive;
• wherein external ambient light may travel through said one piece cap member to illuminate the building enclosure.

A passive venting device for venting a building enclosure comprising:

• a base member having an outer flange for securing said base member to a surface;
• a vent structure within said base member for permitting gases and vapours to pass through said base member, said vent structure including a filter screen to prevent objects from passing through said base member;
• and
• a one piece cap member immovably mounted to said base member and spaced therefrom sufficiently to permit the free flow of air between said one piece cap member and said base member and through said vent structure;
• said one piece cap member and base member being integrally composed of a translucent plastic containing a pigment additive for inhibiting discoloration in sufficiently large quantity to inhibit discoloration and in sufficiently small quantity to maintain the translucence of said plastic, said plastic having a light transmission efficiency of at least fifty percent;
• wherein external ambient light may travel through said one piece cap member to illuminate the building enclosure.

A passive venting device for venting a building enclosure comprising:

• a base member having an outer flange for securing said base member to a surface;
• a vent structure within said base member for permitting gases and vapours to pass through said base member, said vent structure including a filter screen to prevent objects from passing through said base member;
• and
• a one piece cap member immovably mounted to said base member and spaced therefrom sufficiently to permit the free flow of air between said one piece cap member and said base member and through said vent structure;
• said one piece cap member and base member being integrally composed of a translucent random copolymer polypropylene plastic containing a blue pigment additive for inhibiting discoloration in sufficiently large quantity to inhibit discoloration and in sufficiently small quantity to maintain the translucence of said plastic, said plastic having a light transmission efficiency of at least fifty percent
• wherein external ambient light may travel through said cap member to illuminate the building enclosure.