Humidistat & timer operated These extractor fans are certainly the cleverest with the ability to operate using a timer or based on the humidity levels in the room. It is operated when humidity levels within the room get too high or when the light switch is used, with a timer continuing to run the extractor fan for a predetermined amount of time. Axial  Axial type fans cause gas to flow through in an axial direction which is parallel to the shaft where the blades rotate, making the flow axial at exit and entry. Axial fans are designed to create a pressure difference and force which produces a flow through the fan. 21 ltr/s extraction rate Building regulations stipulate that extractor fans need to be able to extract at least 15 litres of air per second. It’s needed to ensure a minimal build-up of moisture in the room, reducing mould and grime in damp areas. This fan will extract a crazy 21 litres per second! That’s 1.5x what’s recommended!   Zone 2 Rated IP rating stands for 'Ingress Protection rating' and this helps us determine what bathroom electricals can go in particular bathroom zones. An IP (Ingress Protection) number or code is used here in the UK to specify the environmental protection of enclosures around electronic equipment. These ratings are determined by specific tests. These extractor fans can be fitted within Zone 2 as shown below. IPX4 Rating This product has a rating of IPX4 which means it is protected from water splashes from any angle. Recessed wall & ceiling installation These extractor fans can be installed through a wall or recessed giving you that extra bit of flexibility. They can also be installed as portrait or landscape. 3 Year Guarantee When buying anything for your home you need to know that its going to stand the test of time. This is why this product comes with a fantastic 3 year guarantee against any manufacturing defects should the worst happen and the product is not up to standard.