Xpelair Simply Silent Series Square Axial Extractor Fan with IPX4 Rated is available in dual speed (15l/s and 21l/s – selected at install) and intermittent extractor fans control humidity, odours and mould growth effectively in bathrooms, shower rooms, cloakrooms and toilets. These fans includes a run-on timer that is fully adjustable when installed (can be set from 30 seconds to 30 minutes once the unit is switched off) or specify a pull cord for on-demand operation.