Ultra Quiet WC & Bathroom Extractor Fan The Silent Design 150 is a 150mm domestic axial extractor fans for wall or ceiling installations. Ideal for kitchen and utility room ventilation, the Silent Design 150 extractor fan incorporates motors mounted on silent elastic blocks to deliver incredibly silent running with exceptional performance. Innovative Silence The Silent Design 150 extractor fan is the result of a long and meticulous development process by the Research, Development & Innovation Department at EnviroVent, who have patented a new concept; bringing about a revolutionary change in extractor fan design to extract the maximum airflow with the minimum noise possible. Multiple Applications The Silent Design 150 extractor fan is available with a variety of functions including adjustable timers and adjustable humidity sensors. Interchangeable Colour Bars The Silent Design 150 comes with interchangeable colour bars let the fan blend in with every setting.