Product Description The Simply Silent DX100BTR twin-speed extractor fan features Ghost Air Movement Technology designed to deliver near silent ventilation. Meeting the latest building regulations this 4 (100mm) fan is specifically designed for use in bathrooms, shower rooms and ensuites. Requiring a 100mm diameter hole the Simply Silent DX100BTR is an ideal replacement for old noisy fans or as a new installation. The fan has a choice of two speeds that can be set to extract 15 or 21 litres of air per second and with innovative Ghost Air Movement Technology delivers low noise levels of 22 or 34 decibels @ 3 meters ensuring minimum noise irritation (15 litres per second at 22 dBA or 21 litres per second @ 34 dBA) . With a more conventional grille-style fascia finished in Xpelairs cool white, the DX100BTR offers a number of So Simple installation features making it the ideal replacement fan and with So Simple Maintenance features such as a twist and click facia the products is e