| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | filter | Japan | Often used in air purifiers to remove pollutants and allergens from indoor air. | 1 |
| 2 | gas filter | Japan | Less common in households as reliance on natural gas is lower, and traditional housing often uses different heating and cooking methods | 1 |
| 3 | gas filter | Japan | Also used in household gas appliances to remove impurities and ensure clean burning. | 1 |