Ltpgtdx100hts 100mm 4 inch extract fan with integral humidistat and over run timer auto onoff operation via the humidity sensor adjustable for 50 90 relative humidityltbr gtltbr gta comprehensive range of stylish compact and easy to install 100mm 4quot single speed extractor fans suitable for a wide range of applications including bathrooms shower rooms and toilets including zones 1 and 2ltbr gtltbr gtall dx100 extractor fans except the cp clamp packed model