Choosing the Best Bathroom Ventilation: Exhaust Fans, Windows, Skylights, or Dehumidifiers?

Did you know excess moisture in your bathroom can wreak havoc on your walls, ceilings, and even your health? I learned that the hard way when I went away on vacation only to return to a bathroom that resembled a science experiment gone wrong. Fuzzy green patches had colonized my shower grout, and a musty odour hung heavy in the air. Since then, I have become obsessed with keeping my bathroom fresh and moist-free.

In this blog, I am sharing my hard-earned wisdom about choosing the perfect bathroom ventilation solutions with you. 

Why Are Bathroom Ventilation Solutions So Important?

Hot bathroom showers, steamy baths, and even just regular use generate a significant amount of moisture control in the bathroom. This humidity if left unchecked can lead to a variety of problems leading to. 

Mold and Mildew Growth: 

These unwelcome guests are a significant problem in the UK.  According to an estimation, roughly 962000 out of 6.5 households are at an increased risk of various problems due to mould and mildew growth. The damp environment, clinging to the grout ceiling, and even the shower curtain can contribute to it. Not only do mould and mildew look unsightly, but they also pose a variety of health risks, ranging from allergies, asthma and other respiratory problems. Therefore, preventing mould and mildew in the bathroom is essential. 

Structural Damage: 

Excess moisture, if not treated, can seep into the walls and floor. It may cause various problems over time, such as peeling paint, wallpaper bubbling, and even wood rotting. This may lead to costly repairs for structural damage, compromising the structural integrity of your home. 

Unpleasant Odours: 

Trapped moisture and the growth of mould and mildew often cause a musty smell in the bathroom. You will need proper ventilation to help eliminate these odours. If there are visible signs of mould then remove it too and arrange ventilation to keep it from returning. 

Foggy Mirrors and Windows:  

If you occasionally see foggy mirrors and windows in your bathroom, it's a sign of excess humidity. It will sooner or later turn into various problems, including the damaged mirror. It also causes inconvenience when using mirrors. You will need proper ventilation to solve this problem.

Best Bathroom Ventilation Solutions For UK Homes: 

There are several ways to ventilate your bathroom. 

Exhaust Fans: 

Using an exhaust fan for ventilation is the most common and efficient way to reduce humidity in the bathroom. They pull the moist air out of the room while expelling it outside. When choosing the best exhaust fan for your bathroom in the UK, you should first consider the ability of the exhaust fan to pull air out of the bathroom. Ideally, your bathroom size helps determine the right CFM (cubic feet per minute) for the space.

It can be calculated by its volume (length x width x height) and multiply it by 0.13. The first thing that you should consider when buying an exhaust fan is its ability to move air per minute. To determine the right CFM for your bathroom, measure its volume (length x width x height) and multiply it by 0.13. Another thing that you should think about is the level of noise produced by the fan. Bathrooms should be peaceful, and you don’t want a fan with a higher noise output.

Experts recommend exhaust fans for bathrooms with a sone rating of 1.5 or lower for peaceful space.  Additionally, you should check the fan for the HVI (Home Ventilating Institute), ensuring that the fan is tested for reliability and performance. Also, look for additional features to enhance their functionality, such as timers for working control, humidity sensors, motion sensors, and lights. It is one of the most energy-efficient bathroom ventilation options with low energy consumption. 

Windows: 

Bathrooms with windows usually don’t have moisture buildup, as opening a window can ventilate the bathroom. For the best results, ensure the windows are right opposite the shower or bath area. This creates cross ventilation, allowing for efficient airflow. You will also need to consider the window style for optimum ventilation. 

• Casement Windows: These crank open outward, allowing for excellent airflow even in a light breeze.
• Awning Windows: Hinged at the top, awning windows can be left open during light rain, providing ventilation without letting in water.
• Sliding Windows: While not as effective as casement or awning windows, sliding windows can still provide decent ventilation when opened fully.

If opening the window does not reduce the humidity, you can try boosting its effectiveness by installing a fan. Depending on your needs, it can either intake fresh air or exhaust stale air. If you are concerned with privacy due to windows, then try using frosted glass, blinds, or curtains that still allow the light to come in. Overall bathroom windows for ventilation are an excellent solution in mild climates. 

Sky Roof and Skylights: 

Both sky roofs and skylights can be an alternative solution for natural light and ventilation in your bathroom. Other benefits of bathroom skylights include creating a sense of spaciousness and connection to the outdoors, making your space feel brighter and airy. 

These are available in a variety of types, such as

• Operable Skylights: Prefer these skylights for better control (remote or manual) over opening and closing as per your requirements. Skylights for bathrooms brings natural lights in and enhance the ventilation especially with operable moderls.  
• Venting Skylights: Specifically designed for ventilation, these can be an excellent solution for exhausting moist air out of the bathroom. 

Skylights and sky roofs can be great solutions for a better bathroom experience. Experts recommend combining windows and skylights for optimal ventilation. This will allow for maximum natural light and airflow, making your bathroom feel airy and spacious. 

Dehumidifiers: 

Dehumidifiers can also be an effective solution for moisture control in the bathroom. Prefer these to keep moisture levels to a specific limit when alternative ventilation solutions are not viable. The benefits of dehumidifiers include

1. Dehumidifiers effectively reduce humidity levels, preventing condensation on surfaces and inhibiting the growth of mould and mildew.
2. Lower humidity levels can make your bathroom feel more comfortable, especially during hot and humid weather.
3. By reducing moisture, dehumidifiers can help prevent musty odours caused by mould and mildew.

You can choose from refrigerant dehumidifiers, which are most commonly used but may not be effective in cooler climates such as the UK. Desiccant dehumidifiers use moisture-absorbing materials such as silica gel to remove moisture from the air. 

When choosing a dehumidifier, you will need to consider its capacity and coverage area in the context of your bathroom size. Other features that you should look for in a dehumidifier for your bathroom include a humidistat, timer, air filter, and continuous drain. 

Exhaust Fan Vs. Windows Vs. Skylight Vs Dehumidifiers Which One is Better

Here in this table, we have compared different bathroom ventilation solutions. 

The suitability of a specific bathroom ventilation solution depends on various factors such as bathroom size, humidity levels, and whether you have windows or space for a skyroof available. An exhaust fan is best for a bathroom with no windows or limited ventilation. Widows, on the other hand, offer an effective solution in mild climates. Dehumidifiers are perfect for enclosed spaces but for airflow improvements.  

Ending Thoughts

So, here you have it all you need to know for choosing the perfect bathroom ventilation solution. I hope you now have a better understanding of why you need a better ventilation solution for your bathroom. Remember, bathroom ventilation is an investment in your home’s health and family’s well-being. That’s why you should take moisture buildup in your bathroom seriously and choose one of the affordable bathroom ventilation ideas discussed earlier. 

FAQs (Frequently Asked Questions)

Here we have discussed a few frequently asked questions about bathroom ventilation. 

1. What is the best bathroom ventilation solution for a windowless bathroom?

For a windowless bathroom, you will need an exhaust fan ducted to the outside. It is one of the most effective solutions to remove moist air and odours directly. You should ensure that the fan is proportional to the bathroom size for the optimal performance. 

2. Are skylights effective for bathroom ventilation?

Skylights are primarily designed for light not ventilation. However, some models may have operable windows that may not be sufficient to remove excessive moisture like an exhaust fan. They may even contribute heat buildup or even more moisture if not properly shaded due due to weather conditions outside,

3. How can I calculate the right exhaust fan size for my bathroom?

It is simple and easy to calculate the right exhaust fan size for your bathroom. You will need to use the bathroom's square footage to determine the required CFM (cubic feet per minute) rating for the fan. A general rule is 1 CFM per square foot. You should also consider adding more CFM if the bathroom is frequently used or has a shower/tub.

4. Do dehumidifiers prevent mold growth in bathrooms?

Yes, mold love humid enviroment. Humidifiers may help prevent the changes of getting mold by reducing the moisture levels in the bathroom. The less water in the air is less hospital for mold. Therefore, regular cleaning and use of humidification is essential for proper protection from mold growth in the bathroom. 

5. How can I improve ventilation in a small bathroom?

Installing a properly size exhaust fan is the best remedy for better ventilation in a small bathroom. You should open the door after use and consider using a dehumidifier as well. Let the exhaust fan run for an adequate time period for the best results. Even cracking a window slightly ( if available) will help. 

6. Are energy-efficient exhaust fans worth the investment?

Yes, energy efficiency exhaust fan can save money on electricity bills over time. If energy saving you priority look for the Energy Stary label when buying an exhust fan. They use less energy while providing the same or better performance reducing the environmental impact at the same time. 

7. Can bathroom ventilation reduce odors and humidity effectively?

Offcourse, yes, good ventilation can significantly reduce both odour and humidity in the bathroom. The removal of moist air prevents buildup of musty smells and helps control condensation. This creates a healthier and more comfortable bathroom environment