This door features perforations to promote airflow, thereby protecting and extending the useful life of your equipment. This unit's "large" perforated area covers 68% of the door as opposed to 22% on the standard perforated door. The door is constructed from steel and features a black textured powder-coat finish. Also included is a built-in keylock to increase the security of your setup. Features: This unit's "large" perforated area covers 68% of the door to promote maximum airflow and better cool your equipment. Protect your equipment from dust and other foreign debris by adding a door to your ERK Series enclosure. This model includes a built-in keylock to increase the security of your setup. The door is constructed from steel and features a black textured powder-coat finish.