XD-HT Centrifugal Built-in Extract Fan with Humidity Sensor and Timer Extremely quiet centrifugal fan designed for extracting stale air from small to medium-sized spaces such as bathrooms and toilets in homes, hotels, and offices. Engineered to overcome resistance in long duct systems and suitable for installation in walls or ceilings. Enables simultaneous extraction of unpleasant odors and steam from the room as well as from the toilet bowl or adjacent rooms. Protection rating: IPX5.