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STERR Grey Extractor Fan Bathroom 100 mm with TIMER Inline Extractor Fan - Extractor Fan - Bathroom Fan Extractor - Bathroom Fan

£49.995£99.99Clearance
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If you are unable or don’t want the fan wired off of the lighting circuit and want independent control then an independent switch will need to be installed.

As we have briefly touched on, there are 2 main methods for turning a bathroom extractor fan on and off. You can either wire it into the bathroom lights so that when they are turned on the fan comes on at the same time or you can wire it to its own switch. It must also be possible to isolate the fan by means of a pull cord switch inside the bathroom, or a fan isolation (3-pole) switch outside of the bathroom. Next, the fan should then be connected using 3 core and earth cable (depending on the model the earth may not be required), with the extra cable being used as the switch-live (SL). The final job is to then do the finishing works. If you have created any chases these need to be filled. Once capped over any chases are then filled using a suitable type of filler or plaster. Once dried it can then be sanded flat with the surrounding surfaces and then finally painted.As with the steps above, either a shower isolator switch is used that is normally installed outside the bathroom above the door or it’s possible to use a 3-pole pull cord switch that is usually installed in zone 3 inside the bathroom. If it isn’t and there is no official evidence to prove it’s been done by a professional with the required qualifications then in the event of any issues it is likely that your home insurance won’t be valid and if you come to sell your home then this can again cause huge issues. However, if you are simply replacing an existing extractor fan because it’s broken down or failed then you are allowed to do this under Part P. The 3 pole switch ensures complete disconnection of supply to the fan so that maintenance can be carried out safely, without the need for a qualified electrician to disconnect the wiring (N.B. if you are in anyway unsure of how to carry out routine maintenance/cleaning on the fan, you should always seek the advice of a qualified electrician). There are several types of pipework but generally it’s best to use the PVC type as when using the aluminium round duct, the fan can echo through it when running creating quite a bit of noise, whereas the PVC type is generally silent.

When it comes to the type of extractor fan found in a bathroom there are essentially 2 different types; time switched and non-time switched. The main difference between the 2 is that with a timed switch, when the unit is turned off it will run on for a set amount of time to finish clearing the bathroom and when the time expires it then turns itself off. This then enables the independent pull-cord switch to trigger the fan, and allow it to run on, in accordance with the timer setting when the fan is switched off. This briefly covers the 2 main different types of extractor but for a full and detailed run down, see our types of extractor fan project here. Types of Bathroom Fan Switch Configuration Once isolated, the next job is to install the fan isolation switch/3-pole switch. Where this is done will depend on the switch you have. Firstly the cable is capped over using a PVC capping or piece of trunking. This then protects the cable in the wall.When connecting up the pipework make sure that you first tape the pipe to the fan body using aluminium tape and then also screw up a large jubilee clip around the pipe. This will ensure a full and compete seal. Finally, connect the pull-cord switch that wil be used to turn the fan on and off into the junction box using normal 2-core cabling as with any other light switch. As we have stated above, if an extractor fan is being installed from scratch then this will need to be done by a qualified Part P registered electrician. However is you are simply replacing an existing broken unit then you are able to do this yourself.

Before anything is done at all the very first job is to isolate the power to the circuit you will be working on! This means pulling out the fuse or turning off the MCB for the lighting circuit the bathroom light is getting power from. If you are installing an axial through the wall type fan then you may need to run a short section of pipe between the inner and outer sections so that it bridges the cavity as you don’t want to be pumping moist air down into your empty cavity as this will cause untold amounts of issues. If this is in a ground floor bathroom, you may need to pull up some floor boards to access and wire up. If you are installing an inline fan then you will also need to install the associated pipework that will carry the moist air from the source to the outside. This wiring diagram shows an easy to follow configuration for a bathroom extractor fan fitted with a timer, that’s not going to be turned on by the existing light switch. Instead, we are going to install a new switch that will turn the fan on and off.

An extractor fan is an essential part of any bathroom as it helps to remove the excess moist and humid air produced by the shower and keep any condensation build up to a minimum. Another point to be aware of is that in many installations a 3-pole isolation switch is fitted to the fan to allow it to be totally isolated from its electrical supply in the event it needs maintenance work. The other end is connected to the timed fan terminals as stated by the manufacturer in the instructions provided with the unit.

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