In order to determine the correct roof vent, measure where the vent opens. The standard trailer roof vent opening is roughly 14-1/4" x 14-1/4" and have roof vents that measure 14" x 14".
To pick the correct cover, you will also need to know the type of hinge you need.
There is a 3 point hinge, such as the one on the Camco # CAM40153; a 4 point hinge as seen on the Camco # CAM40154; or a rolled metal continuous hinge like on the Ventline # BVD0449-A03; and universal hinge as shown on... view full answer...