Rather than interrupting the roof line the way other raised vents do, a ridge vent is so low-profile that almost unnoticeable. There are two primary types of ridge vents: shingle-over vents and aluminum vents. ... This aluminum cap is the finished product and does not require additional asphalt shingle ridge caps.
source https://www.inspectorsjournal.com/topic/18749-crack-in-ridge-vent-shingles/?do=findComment&comment=172156
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