Two-Speed Extraction: Airflow Bathroom Extractor Fan is equipped with a high-efficiency 100mm axial impeller, offering airflow rates of 75/90 m³/h (21/25 l/s) across two speed settings for tailored ventilation in bathrooms, en-suites, and toilets. 100mm/4” Duct Size. Advanced Humidity & Timer Functions: Airflow Bathroom Extractor Fan Features an adjustable humidity sensor (65% - 90% RH) and an adjustable timer with settings for 6, 10, 15, and 21 minutes to ensure optimal ventilation when needed and save energy. 100mm/4” Duct Size. Energy Efficient: Consumes just 5/9 watts of power, with a low specific fan power (SFP) of 0.24 w/l/s, making it highly energy-efficient while maintaining top performance. Compact dimensions of 147 x 147 x 131 mm ensure easy installation. Durability & Safety: Long-life ball bearings with a lifespan of approximately 40,000 hours, and IP45-rated for protection against water and dust. Safe for use in wet zones with an RCD and complies with IEE wiring and Building Regulations Approved Document F. QuietMark Award & Quiet Operation: Awarded QuietMark by the Noise Abatement Society in 2014, the fan operates at an exceptionally low noise level of 25 dB(A), ensuring a tranquil environment while maintaining effective ventilation.