The Vent-Axia Lo-Carbon Tempra SELV LHTP (Longer Cell, Humidistat, Timer and Pullcord) 100mm 4" Heat Recovery Fan (403837) is an efficient solution for improving air quality and energy efficiency. This model fits a 100mm diameter hole, making it perfect for kitchens, bathrooms, and utility rooms. With a humidistat, timer, and pullcord control, the Tempra SELV LHTP adjusts automatically to humidity levels for optimal performance. It offers heat recovery efficiency of up to 78%, reducing energy consumption while enhancing indoor climate. Its low power usage of just 3.2 watts and quiet operation at 22dB(A) make it an eco-friendly choice that complies with Building Regulations, ensuring reliable ventilation without sacrificing comfort.