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| HVAC & Refrigeration | ||
| hvac101 | Heating, Ventilation and Air Conditioning | US$7.99 |
| hvac102 | Ventilation | US$7.99 |
| hvac103 | Heating - Central Steam Generation and Distribution | US$7.99 |
| hvac104 | Refrigeration and Air Conditioning | US$7.99 |
| hvac105 | Refrigeration | US$7.99 |