The phrase "black vents" refers to the openings or channels that release harmful or toxic gases or substances, which are usually colored black or dark. Full definition
Black vent openings on the front fenders make for a perfect accent. (cnet.com)
The front of the mouse has an aggressive black vent design, though these vents serve no functional purpose. (techspot.com)
Inside, Backcountry comes with black vent rings, door handles and grab handles, a vinyl - wrapped console lid and door armrests with diesel gray accent stitching, black McKinley leather seat bolsters with black sport mesh inserts, a nine - speaker premium sound system and all - weather floor mats. (autoweek.com)