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| Air permeability (m3 /h/m2 at 50 Pa) | ||
| Note: Minimum specification in the planned revisions to ADL, for all non-domestic building types is 10·0. | ||
| Building type | Good Practice | Best Practice |
| Houses/flats | 10·0 | 5·0 |
| Factories/warehouses | 10·0 | 2·0 |
| Naturally ventilated offices | 7·0 | 3·5 |
| Air-conditioned buildings/ low-energy buildings/ retail stores/ superstores | 3·5 | 2·0 |
| Museum and archival storage | 1·7 | 1·25 |
| Cold storage | 0·8 | 0·4 |