The Vent-Axia VASF100B Silent Fan is a two speed, 100mm bathroom/toilet fan with a backdraught shutter. Silent Fan / Quiet Fan. The quietest bathroom fan on the market. The VASF100 provides stylish and silent ventilation without compromising on performance. Complies with current building regulations Part F&L Features: Silent intermittent bathroom fan with a choice of 2 speeds, selectable at installation New and improved model - Now even quieter at only 14db(A)! Extremely operation quiet - 14 dB(A) Costs less than £1 per year to run Stylish discrete design Backdraught shutters included High efficiency motor 2 year manufacturers guarantee IP44 rated Standard thermal overload protection (S.T.O.P) on motor Suitable for wall, ceiling, window and panel mounting Compatible with low energy lighting