Extractor fans work in a hard environment: warm damp air, dust, lint and long duct runs. A cheap fan in a steamy bathroom may fail early, while a good fan with a short duct route can last longer.
Do not treat fan replacement as only a plastic grille swap. Bathrooms are electrical special locations, so wiring, zones and isolation matter.
Extractor fan symptoms and next steps
| Symptom | Likely issue | Next step |
|---|---|---|
| Mirror stays wet for a long time | Weak fan, blocked grille or poor duct route | Clean and inspect, then check airflow. |
| Rattling or grinding | Wear, loose grille or bearing issue | Service or replace before failure. |
| Fan does not start | Electrical or motor fault | Use a registered electrician. |
| Mould keeps returning | Ventilation may be underperforming | Check fan, duct route and use pattern. |
| Old noisy basic fan | End-of-life or poor specification | Consider a better replacement. |
Extractor fan replacement checker
Tick the symptoms to decide whether to monitor, clean or replace.
Clean first
Dust and lint can reduce airflow before the fan is actually dead.
Duct route matters
A long or crushed duct can make a good fan perform badly.
Electrical safety
Bathrooms need suitable IP, zone and isolation checks.
Upgrade timing
A refit is the best time to improve extraction route and control.
Sources and checks used
- Electrical Safety First bathroom safety: bathroom electrical safety context
- Scottish Government Building Standards: Scotland standards context
- IET Wiring Regulations: wiring-regulation reference
- Energy Saving Trust ventilation: home ventilation guidance
FAQ
How long should a bathroom extractor fan last?
Around ten years is a useful guide, but noise, steam clearing and motor behaviour are more important.
Can I replace a bathroom fan myself?
The grille can often be cleaned, but wiring or replacement should be checked by a registered electrician.
Why does mould return even with a fan?
The fan may be underpowered, blocked, poorly ducted or not running long enough after showers.
Planning bathroom work in Aberdeen? ABC Home can coordinate the practical route through bathroom fitting, plumbing and electrical services where the job overlaps.
