Ltpgtdx100hptr 100mm 4 inch extract fan with integral humidistat over run timer and pullcord auto onoff operation via the humidity sensor adjustable for 50 90 relative humidity pull cord over rides automatic function timer adjustable from 30 sec to 30 minutesltbr gtltbr gtall 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 gl