Solar Thermal, Hot Air, and Passive technologies

Discuss systems that collect and use heat directly.

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  1. kethutinh9xx68
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  2. kethutinh9xx68
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  3. huongkkk99
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  4. huongkkk99
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  5. kethutinh9xx68
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  6. huongkkk99
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  7. huongkkk99
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  8. huongkkk99
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  9. huongkkk99
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  10. huongkkk99
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  11. huongkkk99
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  12. huongkkk99
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  13. huongkkk99
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  14. huongkkk99
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