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| 21. | warm-air pipeless heating |
| 无管热风采暖 |
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| 22. | warm air heating unit |
| 热风供暖装置 |
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| 23. | gusts of warm air |
| 一阵阵温暖的空气 |
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| 24. | central warm air furnace |
| 中央式暖气炉 |
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| 25. | axial warm air heater |
| 轴流暖风机 |
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| 26. | warm-air heating system |
| 热风供暖系统 |
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| 27. | current of warm air |
| 嗳气流 |
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| 28. | warm air distribution system |
| 暖空气分配系统 |
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| 29. | warm air supply duct |
| 暖风供气管道 |
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| 30. | warm air convecting upward. |
| 暖空气向上流动 |
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