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21U Server Racks and Data Cabinets

21U server racks and data cabinets from Server Room Environments on short lead times with a range of options and features to meet wide set of applications: server room, datacentre, office, retail, distribution, industrial and other harsh environments. This range of 21U racks ranges from budget priced enclosures in our Value range to Premium models made from thicker steel to cabinets designed for roadside and extreme environments. For each of the racks there is a range of accessory to allow customisation of the cabinets on site in terms of shelves and trays, cable management and blanking plates, in-rack cooling options and temperature monitoring.

21U Rack and Cabinet Guide

When selecting a rack or cabinet there are several factors to consider.

Rack Height

A 21U rack or cabinet can house equipment whose total height when placed into the rack is no more than 0.93m. Care therefore has to be taken when selecting a rack to make sure that there cabinet height is sufficient to house the IT server, networking peripheral or IoT device.

U Height Metres Centimetres Millimetres Feet Inches
21U 0.93m 93.35cm 933.45mm 3.06ft 36.75"

For referrence 1U=1.75inches or 44.45mm.

Rack Width

The standard rackmount width is 19inches (482.6mm) and cabinets are typically available in 600mm or 800mm width. Most products will either fit to the front rack pillars using cage nuts onto flanges attached to the rack-mountable device, or slide rails running from the front to the rear pillars or sit on internal shelves or slide-out trays. Room should be left around the rack for adequate air flow and access.

Rack Depth

The depth of cabinet available range from 600-1200mm. Care should be taken when selecting a rack depth to ensure that it is suitably long enough for the equipment to be housed including any necessary space for cables (bend radius) and connection access. How to manage cables is important for any rack size for easy cable identification and to avoid accidental disconnection.

Open or Closed Racks

The majority of server racks and data cabinets supplied are enclosed rather than open frames. An enclosed cabinet with a front and rear door and side panels is more secure and will provide with more efficient airflow management.

If you cannot find the 21U rack or cabinet you need please contact our projects team.


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