This is a EIA Compliant 19 inch equipment rack but is far from standard. It features integrated venting systems (active venting) as well as other cooling options that require no additional space in the rack. The integrated cooling and optional features provide for aggressive yet quiet and cost effective solutions for cooling in even the most demanding situations.Beyond features not seen in any other rack system on the market, this rack is a tremendous value when considering that built-in it has the equivalent of 180 in cooling products. Additional value is created when using additional assemblies because only fan assemblies are required, not complete units.This rack comes with the option to utilize five fan assemblies with each assembly featuring four 50mm fans. There are three of these assembly locations in the top and two in the bottom. The racks comes standard with two fans assemblies but additional assemblies can be added as needed (purchased separately).The rack also features the ability to install larger 92mm intake and exhaust fans in top and bottom trays of the racks. Install two or four 92mm fans in the top and or bottom trays for the most extreme cooling.