Fully-vented recessed rear door is made for use with 19-inch wide rack. The door mounts left or right with spring loaded hinge pins. Door orientation is field-changeable. It is made with sturdy 16-gauge steel for strength and durability. The door has a black wrinkle powder epoxy finish. It includes key-lock. The door allows enhanced front-to-rear air flow for racks with a fully-vented front door or open front.