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| Airtightness | |
| Type of new building | Current thinking: Permeability in m3/h/m2 at 50 Pa |
| Dwellings: naturally ventilated | 10 |
| Dwellings with balanced whole house mechanical ventilation | 5 |
| Offices and retail – naturally ventilated | 10 |
| Offices and retail with balanced mechanical ventilation | 7 |
| Industrial and warehouses | 7 |
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