There are specific areas in your home that are vulnerable to problems caused by localised humidity, including the kitchen, toilet, laundry, and sauna (if you have one). The steam generated by cooking, hot water, and clothes dryers may have a big impact on the environment of your house. If moisture is left to collect, it can cause mildew and mould to grow on the walls and ceiling. An exhaust fan is a straightforward solution to this problem.

What is the function of exhaust fans?

Exhaust fans operate by sucking hot or humid air out of a narrow, localised area and allowing fresh air to come from somewhere else (such as a doorway or vent) to replace it. The heated air drawn out by an exhaust fan is then drawn into a ducting mechanism and expelled outside. These fans are most often used in toilets, kitchens, and laundries due to the steam and humidity that accumulates. Exhaust fans in kitchens have range hoods over cooktops.

Some exhaust fans employ sensors that allow them to automatically activate when they sense that there’s steam in the room.

Below is the advantage and disadvantage of exhaust fan:


  • Effective way to keep moisture out of bathrooms, kitchens and laundries
  • Cost effective approach to ventilation
  • Good in humid areas
  • Can be installed where windows can’t


  • Can be noisy
  • Only provides localised ventilation
  • Not as effective as opening a window

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