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      <marc:subfield code="a">At head of title: Fact sheet.</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Réduire le gaspillage d'énergie par la récupération de chaleur.</marc:subfield>
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      <marc:subfield code="a">"This fact sheet explores various passive heat recovery systems and provides high level descriptions of how to improve their operational and energy efficiencies. The goal is to help building owners and operators develop an understanding of heat recovery systems and how they can be optimized to improve energy performance"--Page [1].</marc:subfield>
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