| 摘要 |
A vent structure that acts as a combination masonry guide and lintel. The flat interior portion has flanged sides and a bottom disposed perpendicular to the interior plate. An opening is provided in the interior plate so a vent pipe can pass therethrough. The upper flange is the same size as a masonry lintel and is longer than and overhangs the side flanges. The structure is preferably integrally formed from plastic or metal. An exterior protective closure is mounted on the masonry guide once the building structure has been completed. The closure mounts on the vent pipe and will open when air or other fluids are passing from the vent pipe and will automatically close when the flow ceases.
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