Exhaust Fan Sizing
Minimum 25L/s for standard bathrooms. Larger ensuites need 30-40L/s. Calculate: bathroom volume x 8 air changes/hour.
Ducting Requirements
Rigid ducting outperforms flexible. Shortest run to exterior. Avoid 90-degree bends. Terminate above roof or through wall with flap damper.
Natural Ventilation
Openable windows (600x600mm minimum) supplement mechanical exhaust. Cross-ventilation ideal but rare in bathrooms. Louvred doors aid airflow.
Moisture Management
Run exhaust 10-15 minutes post-shower (timer switch). Squeegee glass screens. Wipe condensation from tiles. Address leaks immediately.
Mould Remediation
Surface mould: vinegar or dilute bleach. Recurring mould indicates ventilation failure or waterproofing breach. Investigate before repainting.
Key Takeaways
- Size exhaust to 8 air changes per hour
- Rigid ducting prevents airflow loss
- Timer switches ensure adequate post-shower extraction
- Windows supplement mechanical ventilation
- Recurring mould signals systemic failure
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