Ltpgtthe intervent nvf150t 150mm 6quot extractor fan by manrose has an integral adjustable electronic timer 1 20 mins to be operated by lightswitch with set overrun timer but will operate automatically when rooms relative humidity level exceeds 75ltpgt ltulgt ltligtwattage 25 wltligt ltligtsuitable for larger bathrooms utility rooms shops offices restaurantsltligt ltligtintegrated adjustable electronic timer 1 20 minltligt ltligtextr