Extractor Fan Airflow Calculator
Duct / grille shape:
Comparison below is against commonly recommended minimum extraction rates for domestic intermittent fans.
| Location (intermittent fan) | Recommended | Result |
|---|---|---|
| Bathroom / Shower / En-suite | 15 L/s | – |
| Kitchen (fan adjacent to hob) | 30 L/s | – |
| Kitchen (elsewhere in room) | 60 L/s | – |
| Utility room | 30 L/s | – |
| Toilet (WC only) | 6 L/s | – |