The viewing door is easy to remove. Front door lock. Top and side vented panels. Cooling fan and power supply built-in. Cable entry panels in the rear section. Two Cable entry openings on the top of the wall mount. Easy accessory installation. All models are provided with internal mounting rails. Ships fully assembled. Shelves and patch panels not included. Structural integrity, cooling, and cable management in 1. Add a wide variety of shelving accessories and products with ease. Ideal for a variety of rack-mounted servers, storage products, audio/video equipment. Comes with 12 sets of washers, screws, cage nuts. Comes fully assembled.