Adequate ventilation is required for proper operation of today's servers. NetShelter Enclosures include fully perforated front and rear doors to provide ample ventilation for servers and networking equipment. The perforation pattern provides 844 square inches of open area on the front door, exceeding requirements set forth by major server manufacturers. Although this ventilation pattern provides adequate cooling for most configurations, OPTIONAL air-moving accessories such as the APC Air Distribution Unit and Air Removal Unit are available to support higher heat density applications.