Which is the best 40U Rack for me? Comparing racks can be a daunting task. Even comparing racks with similar dimensions can be like comparing apples to oranges. In addition to your dimension requirements, please also take into consideration the rack's cooling capabilities and cooling options, compatibility, load capacity, cable management options, rack accessories, rail mounting, and overall rack expandability. For additional help, please contact our expert sales engineers at 1-866-722-5776 or join us on Live Chat.