These specially designed shelves are suitable for applications where there is a need to access installed equipment for maintenance, upgrading, cleaning, etc. The pre-assembled cable management arm prevents tangles, twists and damage from cuts, kinks, etc. during shelf extension or retraction as well as maintaining proper bend radius of cable. Shelves mount to the four vertical mounting rails. Two depths are offered (18” and 24”) to provide clearance for cables, ventilation, power strips, etc. Shelves have adjustable mounting depths of 14” to 24” for the 18” shelf and 18” to 30” for the 24” shelf. Offered in either vented or non-vented styles. Vented shelves are designed to optimize air flow. Sold individually.