The Vent-Axia 473809A Lo-Carbon DMEV 100 HT Axial Extractor Fan is a square-shaped, 4" diameter fan designed for continuous ventilation in bathrooms and kitchens. It features a timer control of 30 minutes and can be mounted on the wall, ceiling, or soffit. This fan, made of plastic and operating on a 240V electric power source, is energy-efficient with an A energy efficiency rating. With an analog/mechanical control style and programmable timer features, this fan from the United Kingdom brand Vent-Axia offers efficient and convenient ventilation solutions for your home.