| Value | Category | Cases | |
|---|---|---|---|
| 1 | Open fire or stove without chimney or hood | 3470 |
95.4%
|
| 2 | Open fire or stove with chimney or hood | 59 |
1.6%
|
| 3 | Closed stove with chimney | 14 |
0.4%
|
| 4 | Other | 94 |
2.6%
|
| Sysmiss | 301 |