Vent-Axia 439975 Silhouette 100SVT. Vent Aia Are One Of The Largest And Renowned Producers And Manufacturers Of Ventilation Systems For Residential And Commercial Purposes. Amongst Their Vast Array Of Products Is The Silhouette 100 Selv (Safety Extra Low Voltage) Range, Offering Ipx7 Rated Fans Which Are Suitable For Installation In Zone 1 Of A Bathroom. The Va 439975 Silhouette 100Selvsvt Is A 100mm, Single Speed Bathroom/Toilet Fan, With An Integral, Adjustable Overrun Timer (5-30 Minutes), An Indication Light And A Back Draught Shutter. Controlled By A Mains Safety Isolating Transformer, This Selv Model Fan Is Reliable, Stylish And Designed To Provide An Unobtrusive Look Whether Installed In A Wall, Ceiling, Panel Or Window. The Fan Also Features Downstream Airflow Guide Vanes For Improved Pressure Development And Can Be Used Either Horizontally Or Vertically.