V/Axia W362320 Eco400 Speed Controller (T Series). Vent-Axia Has Been The Leading Manufacturer For 75 Years When It Comes To Ventilation. With This Experience Behind Them, It'S No Surprise That They Are Innovators As Well, Continuously Producing New Lines With Energy Saving, Lo-Carbon Products. With A Vast Range Spanning Cool Air To Electric Heating, And Everything In Between, You Know Vent-Axia Is A Name You Can Trust With Your Ventilation Needs. The Va W362320 Is A Surface Mounting Ecotronic Controller, Allowing Extract/Intake And Speed Variation With T-Series And Standard Range Fans (Different Ranges Should Not Be Mixed). The Controller Is Suitable For Use With Groups Of Units Of Any One Size, Up To A Total Of 400W. It Has An ‘E’ Running Position For Optimum Efficiency And Finger-Tip Sliders For Convenience. The Controller Also Features An Adjustable Minimum Speed Setting And A Sensor Mode For Use With Compatible Products. Dimensions: 86 X 156 X 53mm (H X W X D)