This white square-corner louvered compartment door is hinged at the top with a continuous hinge and secured at the bottom with a non-locking cam lock.  The frame is secured to the outside skin of your trailer with screws or rivets.  The heads of the fasteners reside in a shallow mill finish channel that could be covered with a vinyl cover strip if so desired.

Cut-out dimensions: 13-3/4"H x 21-3/4"W.