The Vent Axia Silhouette 100H is a slimline, single-speed 4-inch/100 mm extractor fan suitable for a bathroom/toilet. It is a model with an integral adjustable auto humidity sensor from 60-90% RH, a fixed 15-minute overrun timer option via jump switch, an indication light, and a backdraught shutter. It boasts an airflow of 75m³/hr and, with a chamfered profile of only 17mm, the Silhouette blends in with the wall surface to provide an unobtrusive installation.