The Vent-Axia Silent VASF100B is a 4"/100mm axial bathroom and toilet fan featuring a high efficiency motor and a seven-blade impeller. It delivers exceptional performance at incredibly low noise levels, with a minimum of 14dB(A). The fan offers two selectable speeds, factory preset to 15L/s for toilet installation and adjustable to 21L/s for bathroom use, complying with current building regulations Part F&L. Specifications include a stylish, discrete design, IP44 rating, suitability for wall, ceiling, window, and panel mounting, and backdraught shutters. It meets current building regulations approved document F and L.