Twist & Click fascia for simple installation and maintenance. Ghost Air Movement technology delivers extremely quiet operation by using long-life, silent-running motors. With precision-engineered components to avoid all forms of mechanical noise. Supplied with fully interchangeable square and round baffle covers. Stylish, sleek design. Aluminium and ABS plastic construction. Simply Silent Contour C4 range of 4 inch/100mm extractor fans are ideal for bathrooms, shower rooms, cloakrooms, and toilets. They can be easily fitted in walls, ceilings, and panels and have a choice of two speeds to select from at installation to conform to Building Regulations Part F requirements.