Ridge vent
Encyclopedia
A ridge vent is a type of vent installed at the peak of a sloped roof
Roof
A roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous....

 which allows warm, humid air to escape a building's attic. Ridge vents are most common on shingled
Roof shingle
Roof shingles are a roof covering consisting of individual overlapping elements. These elements are typically flat rectangular shapes laid in rows from the bottom edge of the roof up, with each successive higher row overlapping the joints in the row below...

 residential buildings.

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