DX100HTS 100mm 4 inch extract fan with integral humidistat and over-run timer. Auto on/off operation via the humidity sensor adjustable for 50-90% relative humidity. A comprehensive range of stylish, compact and easy to install 100mm (4\") single speed extractor fans. Suitable for a wide range of applications including bathrooms, shower rooms and toilets, including zones 1 and 2. All DX100 extractor fans (except the CP clamp packed model) come complete with a universal mounting kit comprising of a wall tube, gasket x2, outer grille and skirt moulding for window mounting in single glazing up to 6mm. Also suitable for wall or ceiling mounting. DX100 models also include an air operated backdraught shutter, outer grille and ducting.