Hold a tissue to the bathroom vent: How to tell if your exhaust fan is pulling air properly
To ensure your bathroom exhaust fan is functioning properly, try a simple tissue test. This essential fixture aids in moisture removal, preventing mould from taking root. To further combat humidity, refrain from hanging wet garments and maintain c...
A quick tissue test can determine whether your bathroom ventilation is effective. This ventilation is crucial in minimizing moisture accumulation that promotes mold growth in humid spaces. (Representative Image)
Most of us walk past the bathroom vent every day without giving it a second thought. It sits quietly on the wall or ceiling, doing its job in the background. According to guidance on the NYC Housing Authority's mould prevention page, there is an easy way to check whether the vent is working properly. All it takes is a small piece of tissue paper held up to the exhaust grill. If it sticks to the grill, the fan is drawing air out. If it falls away, the fan may need attention, giving residents an early indication that the ventilation system needs checking.
Why this little test actually matters
Bathrooms can accumulate a lot of moisture. Hot showers, baths and running taps release water vapour into the air, and that moisture can settle on tiles, grout, paintwork and other surfaces. An exhaust fan is designed to remove humid air from the room, helping the bathroom dry out after bathing.
Fans and vents can also become less effective when dust and debris accumulate around the grill. NYC Housing Authority advises residents to request repairs when there is no suction or when the vent grill is clogged with dust. A visible obstruction should be dealt with before relying on the tissue test, since the condition of the grill can affect airflow through the vent.
If a bathroom has no exhaust fan, opening the window and door after a shower can improve air circulation and allow moisture to escape. Where weather and privacy conditions permit, leaving a window open for a period after bathing can also help the room dry.
By making minor adjustments, such as drying laundry outside and wiping down wet surfaces, you can significantly cut indoor humidity. Additionally, resolving leaks and addressing spills promptly thwarts moisture from penetrating walls, ensuring a healthier, mold-free living environment. (Representative Image)
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Simple habits that keep bathrooms healthier
Ventilation is only one part of controlling bathroom moisture. The mould-prevention guidance also recommends avoiding habits that add unnecessary dampness to the room. Wet clothing should not be hung above the bathtub because damp fabric can add moisture to an already humid bathroom. Laundry is better placed somewhere with sufficient airflow for drying.
Damp bathroom surfaces should also be dealt with after bathing. Water and condensation left on tiles, walls or other surfaces can keep the room damp for longer. Removing excess moisture helps the bathroom dry more quickly and limits the conditions that can support mould growth.
Deal with leaks and standing water quickly
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Leaks require particular attention because moisture can collect in areas that are difficult to see or dry. NYC Housing Authority advises residents to report leaks from pipes and appliances to building management promptly. Water that reaches flooring, walls, or other building materials can create a persistent damp area if the source is not addressed.
The same principle applies to spills and bathwater. Water left on floors or walls should be cleaned up rather than allowed to remain in contact with building materials. Keeping these areas dry reduces the amount of moisture available for mould growth.
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When to check the vent again
The tissue test does not need to become a daily task. Once the vent grill is clear, it can be used again whenever there is a reason to suspect that the fan is no longer working as expected. Signs include a bathroom remaining damp for longer after showers, increased condensation, or a noticeable change in the fan's performance.
The basic routine is straightforward: inspect the grill, clear or report any visible obstruction, and use the tissue test when there is a clear vent and a reason to check the fan's suction. If the tissue does not stay against a clear grill while the fan is running, the ventilation system may need maintenance.
Together with prompt attention to leaks, drying of damp surfaces and adequate airflow after bathing, these simple measures can help keep bathroom moisture under control and reduce the conditions in which mould can develop.
