Supply per room
Supply air per room, in m³/h:
| Room | Supply (m³/h) |
|---|---|
| Bedroom for two persons, or a room without a specified function | 30 |
| Bedroom for one person | 20 |
Continuous extract
Continuous extract per wet room, in m³/h. The dwelling as a whole needs at least 50 m³/h, and supply and extract are equal: the lower is raised to the higher.
| Room | Extract (m³/h) |
|---|---|
| Kitchen | 20 |
| Bathroom or shower | 30 |
| Separate toilet | 15 |
Worked example
A home with a living room, a double bedroom and two single bedrooms. Supply: 30 (living room) + 30 + 20 + 20 = 100 m³/h. Extract: kitchen 20, bathroom 30 and toilet 15 = 65 m³/h. Supply and extract are equal, so the extract is raised to 100 m³/h.
How Aira applies it
The number of persons per bedroom follows the bed spaces: two in the largest bedroom and one in each other, which you can change in the check step and in the result table. Living and work rooms count as a room without a specified function (30 m³/h). Aira uses the lower limit of the ranges the standard gives for kitchen (20 to 35), bathroom (30 to 60) and toilet (15 to 30). A storage room of 10 m² or more gets 10 m³/h; a utility room gets no extract point.
Source
SIA 382/5:2021 is sold by the standards publisher and is not available free of charge. Aira follows published descriptions of the standard from Swiss trade and cantonal sources, and offers the country as a closed beta until the figures are compared with the full text.
- SIA 382/5:2021, Mechanische Lüftung in Wohngebäuden