| Value | Category | Cases | |
|---|---|---|---|
| 1 | Open fire or stove without chimney or hood | 3671 |
87.7%
|
| 2 | Open fire or stove with chimney or hood | 170 |
4.1%
|
| 3 | Closed stove with chimney | 52 |
1.2%
|
| 4 | Other | 294 |
7%
|
| Sysmiss | 230 |