Xpelair C4SR 7W 4"/100mm Bathroom Extractor Fan Combined With Square / Round Baffle-Front - 078339 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. Aluminum and ABS plastic construction. Simply Silent Contour C4 range of 4 inch/100mm extractor fans are ideal for bathrooms, shower rooms, cloakrooms, and toilets.