Do You Need an Extractor Fan in a Bathroom with a Window?

Typically, building codes do not require an extractor fan in a bathroom with a window. On the other hand, Extractor fans are commonly needed in buildings, particularly those with insufficient ventilation.

Aside from ventilation, an extractor fan has other advantages. This article comprehensively explores the importance of an extractor fan in a bathroom with a window and whether or not it is required.

Extractor fans are odd contraptions that aren’t found in every bathroom, and not everyone understands what they’re for. If you’re working on an existing structure, you’ll need to replace or retain any current extractor fans, and if there aren’t any, you may not need to install one. However, whether or not a bathroom has a window, it is necessary to provide appropriate ventilation with an extractor fan when constructing a new structure.

Whether or not a bathroom has a window, having an extractor provides a variety of advantages. Installing an extractor fan in any room of the house can help prevent significant difficulties in the future.

Now for the real question:

Do I Need an Extractor Fan in a Bathroom with a Window?

Yes, because there are numerous advantages to having one over not having one. Let’s examine a few reasons an extractor fan is required in a windowed bathroom.

  1. To Get Rid of Moisture: In a bathroom, an extractor fan aids in the removal of moisture. Mold thrives in damp environments. So, if a bathroom isn’t properly ventilated, mold will flourish and act as a breeding ground for diseases and fungi.

    If your bathroom window is permanently closed, maybe for security or privacy reasons, an extractor fan can help dry up moisture from a hot bath or water spillage.
  1. Increased Ventilation: In a bathroom, adequate ventilation is required. A bathroom with a window does not necessarily mean it is adequately ventilated, and an extractor fan will help improve the room’s ventilation, providing comfort and a unique experience when in use.

    When a bathroom is well ventilated, it creates a cool, moist-free environment, and improves air quality. It draws in warm, humid air from inside and replaces it with the cool, dry air outside.
  1. To control and eliminate odors in the bathroom: Controlling odor is one of the benefits of having an extractor fan. With the help of an extractor fan, an unpleasant stench in a bathroom can be readily taken away.

    An extractor fan in a public restroom helps remove odors and maintain a clean environment for the next user. Only a window can keep the bathroom fresh and clean; therefore, an extractor fan can help.

    Wet towels, rugs, and other fabrics, as well as water spilled on surfaces during showering or washing, might emit an unpleasant odor. The use of an extractor fan can assist in eliminating this, leaving your bathroom looking clean and comfortable.
  1. To reduce the air moisture level: It’s critical to keep a bathroom’s humidity low to keep it clean. Excess humidity can cause paint to spill and wallpaper to pill, causing damage to the bathroom walls. Even under extreme conditions, doors can distort.

    When the humidity level is high, mold can quickly grow and be challenging to remove. As a result, an extractor fan is required in a bathroom to prevent all of these issues.
  1. To reduce contaminants in the air: Cleaning a bathroom is necessary, but we cannot clean it with just water; we must use a disinfectant to thoroughly clean it. When breathed, this disinfectant contains strong compounds that can cause a range of health problems. When it comes to children or adults with existing lung diseases, this is a serious worry.

    An extractor fan will help remove the stink of toxic chemicals, making the bathroom a healthier place. In addition, if the bathrooms already have a mold problem, an extractor fan can help remove the spores from the air. Getting rid of mold and other microorganisms in the bathroom.
  1. To get rid of the foggy mirror effect: Moisture from a steamy bath or water spillage from washing or bathing tends to settle on bathroom mirror surfaces, where bacteria can grow. When you take a hot bath, the air becomes saturated with steam, which then condenses.

    An extractor fan aids in drying water on the floor or other surfaces, controlling moisture and removing water vapor from mirrors, floors, and walls, particularly in bathrooms lacking a demister mirror. An extractor fan will prevent condensation and the growth of mold, which can be harmful to your health. Mold growth can cause respiratory issues such as asthma and skin conditions such as rashes.

Different Types of Bathroom Extractor Fan 

Axial, centrifugal, and inline bathroom extractor fans are the three (3) most common varieties.

  • Axial Extractor Fan: Although the axial extractor fan has the least power, it is acceptable for most applications. Only put them up on walls that have direct access to the outdoors. They’re most useful when the air doesn’t need to travel a considerable distance, usually only a few meters.
  • Centrifugal Extractor Fan: Centrifugal extractor fans are ideal for distances more than 2-3 meters, are more potent than axial extractor fans, and are noisier. They’re best for a bathroom that doesn’t have a lot of external walls. They are frequently installed on ceilings.
  • Inline Extractor Fan: Inline extractor fans are typically installed in the ceiling and can reach a distance of up to 40 meters or more when compared to centrifugal extractor fans. They are the strongest of the three main varieties. They are situated above the bathroom in the loft space.

There are some suggestions to follow when selecting a bathroom extractor fan once you’ve learned about the different types of extractor fans.

Factors To Consider When Choosing a Bathroom Extractor Fan

  • Zones: Because electricity and water should not come into contact, and an extractor fan uses electricity, understanding zones is critical when choosing a bathroom extractor fan. The restroom is divided into three zones: zone 0, zone 1, and zone 2. Zone 0 is the region within the bath or shower, zone 1 is the area 2.25m above the bath or shower, and zone 2 is the area 0.6m horizontally above the bath or shower. Outside refers to any location not included in these categories. This means that your extractor can be installed in regions that are deemed to be outside.
  • Time: When controlling a fan, you have two options: turn it on manually with a cable switch or use remoting control. Some fans have timers that turn them off after a certain amount of time has passed. Passive When someone enters the room, infrared sensors activate, and humidity sensors activate when the humidity or moisture in the air reaches a specific level and then returns to that level.
  • The level of noise: Extractor fans are available in various noise levels; keep this in mind because some extractor fans are really loud, which you may not be comfortable with. There are, however, several low-noise models available, and manufacturers list this information on their labels to familiarize yourself with their noise levels. This information is particularly helpful when you can’t see the model in action.
  • Size: The extractor fan’s size and the bathroom’s size are also factors to consider. A simple four-inch extractor fan will be enough in most cases, but if the bathroom is larger than average, a larger fan of roughly six inches will be required

    Another instance where a larger fan may be required is if your bathroom is very cold. Even if the fan meets the minimum criteria, installing an undersized fan is practically not worth the effort. Knowing how extractor fans are sized and how to choose the proper one for your bathroom is critical.
  • Rate of Air Extraction: The air extraction rate, or volume of air ejected per the second run, is the rate at which the fan expels interior air per unit time. Most fans used in houses have a standard value of 15LPS. If you get a less powerful fan than this, it may not be as effective as it should be.

What Is the Best Location for An Extractor Fan?

When an extractor is appropriately positioned, it performs at its optimum. Install your fan as high as feasible on the wall, and ensure it’s close to the heat source.

To prevent fresh air from being sucked back into your bathroom, keep it away from the window.


Because the nature of the area and its use make it a wet and humid environment by default, a bathroom with a window requires an extractor fan. As a result, it is critical to ensure that all bathrooms are well aired.

It’s also a good idea to create extra ventilation, especially if your bathroom has only one window. If the moistness persists, an extractor fan can help to alleviate the problem.

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