How to Wire a Bathroom Fan?

Bathroom extractor fans require wiring to function, as they are not battery-operated. This means steps must be taken when replacing or installing a new bathroom extractor fan. Dealing with electrical wiring can be dangerous, but can it be done by anyone?

In this blog, we will address the question ‘How to wire a bathroom extractor fan?’

With new buildings being made to be as energy efficient as possible, and the UK aiming for 95% of its electricity usage to be low carbon by 2030, it is imperative to understand how we can make the most of our ventilation. This is where applications such as extractor fans and heat recovery ventilation units come in.

To prevent mould, fresh air should constantly be introduced into your dwelling daily, as it helps to regulate temperature and reduce condensation. Introducing fresh air can be as simple as having a ventilation routine, or installing extractors or MVHR units. Almost all of this is facilitated by ducting.

Do I have to use my bathroom extractor fan every time I use the bathroom?

No. Generally, the usage of a bathroom extractor fan is dependent on the humidity present in the room. If your extractor fan runs manually, make sure to turn it on whilst taking a hot bath or shower, automatic extractor fans have sensors that can detect humidity to start operating.

Bathroom extractor fans also help to get rid of unwanted smells, which can be especially helpful in colder temperatures where you don’t want to open the window to get rid of the smell.

In any case, the method to get the most effectiveness out of your bathroom extractor fan is by using it in conjunction with an open window. The open window allows for an additional exit for humidity and an entrance for cool air to enter, swiftly removing the humidity.

How long should I leave my window open in the bathroom?

This depends on whether your window was open or closed during your hot bath or shower. If it was open, then an additional 10-15 minutes is usually enough. However, if it is closed, you should allow for half an hour minimum. This can fluctuate depending on the temperature and size of the bathroom.

The goal is to not have any condensation settle, this is why opening the window beforehand works so well. Ensuring surfaces are free from condensation reduces the amount of time the window would need to be open.

How to wire a bathroom fan