Extract Rate: Impressive 26 litres per second, 96 cubic metres per hour. This is one of the highest extraction rates for any 4" axial fan. Sound output: 26.5 dB (A) @ 3 metres. This is one of the quietest fans in the market. Awarded Quiet Mark award 2013. Adjustable Timer model. Power Consumption: 8 watts. IP45 rated. Mains 230/240V AC. Please see Product Information section for important electrical connection requirements. CE approved. Dimensions: 158mm wide x 158mm high. Spigot is 99mm diameter (for connection to 100mm ducting) and projects for 80mm beyond installed surface.