How to Fit a Bathroom Extractor Fan

How to Fit a Bathroom Extractor Fan

How to Fit a Bathroom Extractor Fan

Extractor fans, especially those in your bathroom are extremely important to have in working order, but what if you need to install a new one, what do you do?

In this blog we will be telling you how to fit a bathroom extractor fan.

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 PIV systems. Almost all of this is facilitated by ducting.

I-Sells is here to provide the answers you need whilst also supplying you with all the information you need to combat mould and have a well-ventilated home.

What is a bathroom extractor fan?

A bathroom extractor fan is a small fan that is placed on the wall of your bathroom. It is connected to a outside vent, the role of the extractor fan is to facilitate the removal of humid air, smells, and ventilate the air in your bathroom.

Why do we need bathroom extractor fans?

We need bathroom extractor fans because without them, your bathroom will take longer for smells to go, and humid air can settle on surfaces to cause condensation. Opening windows can help to resolve this, but in instances of bad or cold weather, you may not want to open your window all the time.

Prevention of condensation is the main aim of a bathroom extractor fan, if condensation is left, it can easily become mould.

Mould explained

Mould, otherwise known as damp, is a fungus that grows on wet surfaces. Mould comes in a variety of colours: Black, Green, Brown, Grey and White. It can be difficult to identify mould by colour as it can occur in many shades. Some of the most common mould strains in the home are:

  • Black Mould – Also called Stachybotrys chartarum, Black mould is commonly found in bathrooms and wet rooms but can also occur on cold exterior walls in habitable rooms such as the bedroom or living room.
  • Cladosporium – Commonly found in bathrooms, under sinks, and around faucets but it can grow on surfaces like carpets, furniture, walls, and floors.

Mould reproduces from tiny spores. The spores float through the air and deposit on the surfaces. Under adequate temperature, moisture, and nutrient conditions, the spores can form new mould colonies.

Mould can severely affect your immune and respiratory system, as the spores are easily breathable and not obvious to see through the human eye.

If you have found mould in your home, you need to assess if this is your landlord’s responsibility (for example it could be from a leaking roof that needs repairing). Or if the damp is caused by improper ventilation. To assess your options, click here.

How to fit a bathroom extractor fan

How to fit a bathroom extractor fan

We will be addressing the subject of how to install a bathroom extractor fan in sections, from the start of the process to installation and maintenance, and is as follows:

Where to position the extractor fan in your bathroom

Knowing where to install an extractor fan in the bathroom depends on the layout of your bathroom, some homes have a separate room for the toilet and bath/shower. In this case, the room with the shower/bath is the best option.

Generally, bathroom extractor fans can be anywhere on the wall as long as it is opposite the door but again is subject to your bathroom structure and the type of extractor you purchase. As long as it is in the vicinity of the window, (but not below a window) or on a wall that leads directly outside (or proceeded by venting that leads to outside) it should be okay. Once you know where to install it, you can proceed.

What you will need:

  • Pencil
  • Tape measure
  • Drill and correct drill bit
  • Flexible ducting
  • Saw
  • Hammer
  • Chisel
  • Safety equipment
  • Screwdriver
  • Mask and gloves & goggles

The Process

  1. Use a pipe and cable detector, and make sure there are no obstructions inside or outside the wall that will block the fan. Do not place the outlet directly below a window.
  2. For fitting a fan in a new place, you have to make a hole in your wall. Once you have made sure the wall is clear, hold your fan in place, and use your pencil to trace around the circular edge of the fan. Mark the centre point on the wall and drill a hole through the wall for reference.
  3. Drill a series of holes around the circular tracing of your fan at around 35mm apart. Once you have done this, use a chisel and hammer to ‘chop out’ the wall within.
  4. After creating the hole, insert the flexible ducting. It should fit at a slight downward angle whilst being flush against the internal and external walls. Trimmings can be made with the saw. (any repairs to plasterwork should be undertaken now).
  5. On the inside wall, fit the fan over the hole and use your pencil to mark where it is secured to the wall. Drill the holes to insert any necessary fittings. Position the fan over these holes and secure it in place with your screwdriver.
  6. Do the same for the outside wall.
  7.  Now it’s time to make the electrical connections, in compliance with ‘Part P’ of UK building regulations, a qualified electrician must make the appropriate connections. If you don’t use a qualified electrician, you can risk damaging the electric circuits in your home, potentially electrically shocking any resident in the home, incurring a criminal fine, and being made to remove the installation.
  8. After making the electrical connections, secure the grill covers over the fan on the inside of the bathroom and on the outside wall. If the cover has a slatted design, make sure to position them horizontally to keep the rain out. (Resourced from

What do I do if I can’t fit my extractor fan myself?

What do I do if I can’t fit my extractor fan myself?

If you aren’t able to install the extractor fan yourself, it is best to call a qualified electrician. We understand that not all of our readers may have the contacts, or know who to go to when searching for someone to install their extractor fan, click here to find local, trusted electricians.

Where can I buy bathroom extractors?

I-Sells provides a variety of bathroom extractor fans. Our range is from the affordable, to premium, and everything in between. We also supply kitchen extractor fans, ducting, PIV systems, mould control solutions, and more!

Do bathroom extractor fans have timers?

Yes, most bathroom extractor fans have timers that stay on for however long you set it to be. However, we also supply models that operate based on the humidity in the room and turn off once it is below its humidity threshold. Some of our extractor options also feature connectivity with your smart device.

Purchase a bathroom extractor fan today

We at I-Sells endeavour to make sure our customers have all the information they need before choosing to invest in our mould solutions. Be sure to visit our blog page to gain knowledge on the wide array of factors and issues surrounding ventilation, mould, condensation, and much more.

We hope to have answered the question “How to fit a bathroom extractor fan?’’

We understand you may have more questions, Do not hesitate to contact us for more information with regard to whatever you need our help with. If you’d like to send us an email, click here. For other contact options, see below:

Call us on 020 8463 9696

Visit us at our showroom:


Monday – Friday: 8:00 am to 5:30 pm

Saturday: 9:00 am to 12:00 pm

Sunday: Closed

15 St John’s Parade

Sidcup, Kent

DA14 6ES

United Kingdom

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