Commonly used by Jayco RV's as a body vent.
This vent when combined with part number C6246-B forms a through wall body vent which simply clips together and is suitable for an RV with a wall thickness of 30mm.
This vent is part A and features the 4 x 30mm plastic receivers see images for detail. The overall dimensions are 243mm (L) x 141mm (W) however the cut-out size is 212mm (L) x 110mm (W).
Black Exterior Fitting