| Value | Category | Cases | |
|---|---|---|---|
| 1 | Chimney | 267 |
7.7%
|
| 2 | Hood | 40 |
1.2%
|
| 3 | Chimney and Hood | 14 |
0.4%
|
| 4 | Chimney and other | 8 |
0.2%
|
| 5 | Hood and other | 5 |
0.1%
|
| 6 | All exhaust system | 111 |
3.2%
|
| 111 | No exhaust system | 2901 |
84%
|
| 555 | Other, specify | 106 |
3.1%
|
| Sysmiss | 47902 |