Rack unit height: 9 U (i.e., enough space to mount 9 units of 19-inch wide equipment). 

Protection: IP55 — meaning protection against ingress of dust to a level that won’t interfere with equipment, and protection from low-pressure water jets from any direction. 

External construction: Typically 600 mm wide × 600 mm deep (or similar variation) × approx. 500-600 mm height for 9U models. For example one datasheet lists 579 × 600 × 600 mm for 9U variant.

Material: Cold-rolled steel or galvanized steel, powder-coated, with weather-resistant gaskets, lockable door, cable gland entries. 

Applications: Outdoor telecom, network cabinets mounted wall-mount or pole-mount in harsh environments.