Typically, the electric duct fan will only be required on the WooWoo GT LUX, and specifically when it’s installed within the fabric of the building. The inline electric duct fan connects directly to the 110mm vent pipework creating airflow through the GT toilet container, up and out through the vent pipe. There are three power settings on the 230V electric duct fan which consume 22, 24, and 33 watts respectively.
For short and straight pipe runs (4 metres or less), the lowest setting will be more than adequate. If your pipe run necessitates bends or turns, or is very long, then the medium or high setting might be needed.