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Chimney heat economizer

Heating systems – Air – Flue heated
Patent

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Chimney waste heat collector requiring no building renovation

Heating systems – Air – Flue heated
Patent

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Combination weathervane heat exchanger

Heating systems – Air – Flue heated
Patent

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Combined heat-exchanger and supplemental air circulator for hot-

Heating systems – Air – Flue heated
Patent

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