Operator interface enclosures are used to house industrial controls such as display screens, pushbuttons, keyboards, lights, and other operator control devices. They are designed to protect personnel from accidental injury and to prevent the ingress of environmental contaminants such as dust and water. Operator interface enclosures are rectangular or T-shaped and may include a sloped or slanted surface. They are made from a variety of materials and available in many different sizes, sealing configurations, and mounting styles. Length, width, and height are important dimensions. Inside length, inside width, inside height, and sloped surface length are also important considerations. Because some operator interface enclosures can be mounted in several different ways, suppliers recommend viewing product pictures or diagrams to determine which dimensions refer to length and which dimensions refer to width. Most operator interface enclosures are mounted on suspension/pendant systems or pedestals.