What Are the Ventilation Options for a Bathroom Without Windows?

Choosing the right ventilation system for a bathroom without windows is essential, because ventilation lets you reduce the humidity and breathe healthy, unpolluted air. If the ventilation isn’t ensured by a window, it can come from a CMV or an air extractor. In a bathroom, ventilation is also important for the comfort that the renewal of the air provides to this very humid room.

The importance of ventilation in a bathroom

The ultimate humid room, the bathroom, much like the kitchen, is a separate room in a house that needs to be properly ventilated, especially because it receives direct contact with water and moisture. Its proper ventilation is necessary to ensure the well-being of the occupants of the premises, whose health can be affected by an excessive humidity level in the air, which can cause breathing problems or skin or eye infections. It also helps prevent condensation and therefore the deterioration of the paint, coatings, furniture, or electrical systems.

The solutions for proper bathroom ventilation

  • Natural ventilation: Even if your bathroom doesn’t have a window to the outside, it can have direct contact with the outdoor air via a grid or a ventilation duct. You can also opt for a window aerator, which is a possible solution only if your bathroom has a condemned window. In effect, the window aerator is installed on either side of a window thanks to a cut-out in the panes. It works manually or by being connected to the home’s power grid. However, bathrooms are too humid for this type of light ventilation system to be enough to eliminate the moisture, and you should therefore invest in an additional system.
  • Centralized mechanical ventilation (CMV): A regular or double-flow CMV is installed in most bathrooms in new homes in Québec. Affordable on the price level, a CMV continuously removes the air and moisture present in the room and works by being connected to an air extractor duct, generally located in the attic of a house. A simple CMV has the disadvantage of sometimes making a room colder, while a double-flow CMV, which is more expensive, will preserve the heat in the room for the comfort of its occupants.
  • An air extractor: An alternative to a CMV, an air extractor, also known as occasional mechanical ventilation (OMV), is a simple duct connected to a ventilation duct that starts working with a switch that allows you to turn the system on and off. Some models also let you automate the ventilation at fixed and scheduled times or detect moisture and movement. Easy to have installed by professionals, it’s an economical ventilation system that is often implemented during a bathroom renovation. In particular, you can opt for a hot air extractor that will store the heat emitted in the bathroom to distribute it throughout all the rooms in the house and thereby save energy.

If you have the ability to choose, especially in terms of the budget for the ventilation of your bathroom without a window, we recommend opting for a hot air extractor, especially a model with a switch that is independent from the one that is connected to the lighting. An independent fan lets you leave the fan on long enough to eliminate all the moisture while allowing you to leave the room or turn off the light.

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