Server Rack Sizes: Understanding the Differences - RackSolutions
Server Rack Size / Capacity - rack-singapore.com
Amazon.com: StarTech.com 4-Post 42U Mobile Open Frame Server Rack, 19in Network Rack with Wheels, Rolling Rack for Computer/AV/Data/IT Equipment - Casters, Leveling Feet or Floor Mounting (4POSTRACK42), Black : Electronics