Key takeaways
- A bathroom extractor fan is one of the simplest ways to reduce moisture inside your home, yet many people switch it off too soon. Steam doesn't disappear when your shower ends-it remains in the air until it's...
- Why Timing Matters
- How Long Should the Fan Run?
A bathroom extractor fan is one of the simplest ways to reduce moisture inside your home, yet many people switch it off too soon. Steam doesn't disappear when your shower ends-it remains in the air until it's removed.
Running the fan for long enough helps prevent condensation, mould and lingering damp smells.
Why Timing Matters
A hot shower releases a large amount of water vapour into the bathroom.
If that moisture isn't extracted, it spreads through the house and often ends up condensing on windows, walls and ceilings.
How Long Should the Fan Run?
As a general guide, leave the extractor fan running for around 15-20 minutes after showering.
Some modern systems include an overrun timer that continues operating automatically after the light is switched off.
Keep the Door Closed
Closing the bathroom door while showering helps contain moisture so the extractor fan can remove it more effectively.
Opening a nearby window slightly can also improve airflow if weather permits.
Signs Your Fan Isn't Working Properly
Your extractor fan may need attention if:
- Mirrors stay fogged for a long time.
- Condensation forms throughout the house.
- Mould appears on the bathroom ceiling.
- The fan is unusually noisy.
- Airflow feels weak.
When Should You Contact Holmes Services?
If condensation remains a problem despite using your extractor fan correctly, your home may benefit from improved ventilation or an upgraded extraction system.
Frequently asked questions
Is opening a window enough?
It helps, but an extractor fan removes moisture much more consistently.
Should I leave the fan running all day?
Usually no. Around 15-20 minutes after showering is sufficient for most
homes.
Can a poor extractor fan cause mould?
Need practical advice for your system?
Holmes Services helps Auckland homeowners and businesses with heat pumps, ventilation, refrigeration and indoor comfort issues.