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Used to scupe in air under presure from forward travel. These raise the pressure of the interior of the RV and prevent most dust from entering when travelling on dirt roads. Fit to roof, opening forward. Photo shows when open. A flat 22mm wide mounting surface surrounds the vent. It is normally screwed or rivetted to the external skin, but can be glued for a neater appearance. Eight mounting holes are marked, but not predrilled on the mounting face.
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