Nowadays, bathrooms are no longer built without windows. And if so, it is considered more like a construction sin. If fresh air or daylight does not enter the bathroom, you must resort to other measures to help with the proper bathroom ventilation.
In this article, we will tell you how to ventilate a bathroom without a window and which extractor fans will be most suitable for it.
How to ventilate a bathroom without windows?
Even if your bathroom has no windows, you must ventilate it. Specifically, it is prescribed in the standard, which stipulates that rooms without windows must be regularly ventilated. Ventilation is, therefore, mandatory in a bathroom without windows. A volumetric flow rate of 40 to 60 cubic meters per hour is prescribed.
Bathroom ventilation is not just about removing unpleasant odours or damp air. This helps to protect the structure of the building and also prevents the formation of mould due to the accumulation of moisture.
The relative humidity of the air in the bathroom should be a maximum of 65%. During showering, the humidity will rise to 80% or more shortly but quickly drop again after effective air exchange. If you want an overview of the humidity conditions in the bathroom, it pays to buy a hygrometer.
If you have a small apartment with a windowless bathroom, you will likely use a fan for ventilation. However, the operation of the fan can be heard in neighbouring rooms, which is annoying. For this reason, we recommend using a quiet extractor fan.
Tips on how to properly ventilate a windowless bathroom
The most effective alternative solution for a bathroom that does not have windows is a decentralized ventilation system or room recuperation. It drains moist air outside and supplies the bathroom with fresh air. This variant is also suitable for retrofitting, as installing an exhaust pipe is unnecessary. It is enough to drill a hole in one of the outer walls to install the recuperation unit and connect it to the electrical network.
A model with heat recovery is recommended to install a decentralized ventilation system. Its advantage lies in the additional heating of the incoming fresh air so that the room does not cool down so much. The unit thus exhausts waste air but simultaneously sucks in fresh air from outside, partially heated by the heat obtained from the exhaust air and then brought into the room. In this way, up to 90% air exchange efficiency can be achieved.
We recommend using a central air extraction system if you have a bathroom without windows and without external walls. In this case, the extracted air gets out through an unoccupied ventilation connection or a ventilation shaft. For fresh air to flow in, ventilation holes are necessary. The central air extraction system is particularly advantageous for bathrooms in the central part of the building. That’s because you don’t have to create separate air supply ducts.
Electric dehumidifiers are also effective, as they pump large amounts of water out of the air. Electric dehumidifiers connected to the mains can work automatically thanks to the humidity sensor, turning themselves on and off.
What are the benefits of a extractor fan?
The positive aspects of extractor fans are particularly noticeable in a windowless bathroom. They allow the air to be extracted from the bathroom to the exterior, even in the case of internal bathrooms without external walls.
If there is no ventilation in a windowless bathroom, it is often damaged by moisture and also by the formation of mould. Extractor fans remove water vapour from showers and odours from toilets.
Extractor fans offer unquestionable advantages, especially to allergy sufferers. The most important thing for those allergic to house dust or mould is to ensure that the allergens do not spread further. Extractor fans also work against the formation of health-threatening germs. Sometimes even fan ventilation is better than window ventilation, which often creates dust swirling around.