Airtech Turbo Axial Fan with a Run-on Timer, 4" 100mm – perfect for extracting from bathrooms, wet rooms, and showers with short duct runs. It's designed with a detachable mounting foot for easy installation in void spaces, connected to joists, false ceilings, or in-duct (just remove the bracket). Featuring both 4" 100mm solid plastic and flexible duct connections, it offers efficient airflow rates of up to 100m³ per hour. This fan is a popular choice for replacing old, worn-out models due to its cost-effectiveness, easy retrofit capabilities, and relatively quiet operation compared to its high extraction rates. Plus, it includes a built-in adjustable overrun timer (5 to 20 minutes) and requires a 3-wire electrical connection. Upgrade your ventilation with Airtech.