The Vent Axia Response 7 HTP Lo-Carbon Extractor Fan is a square-shaped, continuous vent style extractor fan designed for use in any room, especially the bathroom. It is an electric unit with a 4-inch diameter and two speeds. Made from glossy white plastic, it features a digital display, timer, trickle, and humidistat functions. With an energy efficiency rating of A and an operating sound rating of 13.2 dB(A), this fan from the reputable brand Vent-Axia is a reliable choice for efficient ventilation in your home.