The Vent-Axia Lo-Carbon Tempra LHTP (Longer Cell, Humidistat, Timer and Pullcord) 100mm 4" Heat Recovery Fan (403836) is an innovative heat recovery fan for 100mm diameter installations, perfect for refurbishing kitchens, bathrooms, and utility rooms. With up to 78% heat recovery efficiency, it keeps extracted air warm, reducing energy consumption and your carbon footprint. The LHTP features a built-in humidistat, timer, and pullcord control for flexible operation, with options for continuous or intermittent settings. Available for wall depths of 320mm and 460mm, it fits easily into existing structures while improving indoor air quality by introducing fresh air without excess humidity. Its low power consumption of just 3.2 Watts and quiet operation at 22dB(A) make it an excellent choice for energy-efficient ventilation.