Knut Bø MURO-STYLE 150 B is a 6-inch (150 mm) bathroom extract fan in the MURO-Style series with an integrated backdraft damper and a single-pole pull-cord switch. Its ducted axial impeller ventilates humid rooms directly to outside or through short duct runs to a wall termination. Typical use is bathrooms, toilets and small utility rooms in residential installations.