What TEK17 requires
The pre-accepted performance gives a minimum air flow for the dwelling when it is occupied, a lower flow for rooms without permanent stay, and a flow per planned bed space for bedrooms.
| Requirement | Minimum |
|---|---|
| Average over the floor area, home in use | 1.2 m³/h per m² |
| Rooms without permanent stay (bathroom, toilet, storage, unused basement) | 0.7 m³/h per m² |
| Bedrooms, when in use | 26 m³/h per planned bed space |
Extract rates (pre-accepted, Table 1)
Rates in m³/h, in the basic and the forced setting.
| Room | Basic | Forced |
|---|---|---|
| Kitchen | 36 | 108 |
| Bathroom | 54 | 108 |
| Toilet | 36 | 36 |
| Laundry room | 36 | 72 |
Worked example
A home of 100 m² in use, with four bed spaces. Average air flow: 1.2 × 100 = 120 m³/h. Bedrooms: 4 × 26 = 104 m³/h. Extract in the basic setting: 36 m³/h for the kitchen, 54 for the bathroom and 36 for the toilet; in the forced setting 108, 108 and 36.
How Aira applies it
Aira takes the floor area from the plan and the number of bed spaces from the bedrooms (two in the largest bedroom and one in each other, shown as an assumption you can change). The total is the highest of 1.2 m³/h per m², 26 m³/h per bed space and the sum of the basic extract rates of the wet rooms. The bedrooms get 26 m³/h per bed space; the rest of the supply goes to the other habitable rooms by floor area. Each wet room gets at least its basic rate, the part above that is shared in proportion, and the forced rates are shown as capacity. You can adjust every figure in the table before you download the plan.
Version
The Norwegian authorities are consulting on the requirements in 2026; the page will follow the adopted text.
Source
The figures are taken from the official page of the Norwegian Building Authority (DiBK), checked on 14 October 2026.