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Bathroom Ventilation Ducts And Fans

by Hazards

Bathroom ventilation systems are designed to exhaust odors and moist air to the home’s exterior. No matter how your bathroom is designed, even if you’ve had wet room installation which waterproofs a large section of your bathroom, you will still need some form of ventilation in order to stop the damage that can be caused by a build up of moisture.


  • Most are controlled by a conventional wall switch
  • A humidistat can be preset to turn the fan on and off based on levels of humidity

Bathroom ventilation fans should be inspected for dust buildup that could impede air flow. If this happens to you then you should get the Willard Power Vac air duct cleaning service. Ventilation systems should be installed in all bathrooms.

The presence of any of the following indicates insufficient bathroom ventilation:

  • Moisture stains on walls or ceiling
  • Corrosion of metal
  • Visible mold on walls or ceilings
  • Peeling paint
  • High levels of humidity

The most common defect related to bathroom ventilation systems is improper termination of the duct. Vents must terminate at the home exterior. Ducts that leak can cause problems from condensation. This condition has the potential to cause health and or decay problems from mold, or damage to building materials.

Ventilation Ducts:

  • Must be oriented effectively in order to ensure that stale air is properly exhausted.
  • Terminate outdoors
  • Contain a screen or slat at its termination
  • Longer ducts allow more time for vapor to condense. Therefore, they must be as short and straight as possible.
  • Protrude several inches above roof
  • Should be made from rigid material and have smooth interiors to prevent condensation

Above all, a bathroom ventilation fan should be connected to a duct capable of venting into the outdoors. Mold growth within the bathroom is a clear indication of improper ventilation that must be corrected in order to avoid structural decay and respiratory health problems.