Dimensions: 154mm high x 154mm wide x 27mm deep (beyond installed surface). 99mm exhaust. This fan is normally used in bathroom/toilet locations and is for simple switching on/off from the switch controlling it. It does not have a run-on timer facility and requires 2 wires connected (live and neutral). For a model with a run-on timer, please search for the product with catalogue number AXS100TR. Weight: 1.3007273458 pounds. Manufacturer: Greenwood Airvac.