| Variable | Control room | Treatment room |
|---|---|---|
| No. of pigs | - 5 heads per pen | |
| - Total 50 heads per room | ||
| Type of pig building | Enclosed type | |
| Time and frequency of air sampling | - Between 2 pm and 4 pm | |
| - Thrice samplings per 1 test | ||
| - Total 5 iteration tests | ||
| Unit of air cleaner | × | O (6 sets) |