DX100HPTR 100mm 4 inch extract fan with integral humidistat, over-run timer and pullcord. Auto on/off operation via the humidity sensor adjustable for 50-90% relative humidity. Pull cord over-rides automatic function. Timer adjustable from 30 sec to 30 minutes. 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 outer grille and ducting.