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      <marc:subfield code="a">P4-191/2026E-PDF</marc:subfield>
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      <marc:subfield code="a">Making heritage buildings more airtight : </marc:subfield>
      <marc:subfield code="b">a condensed best practice guide for airtightness testing of heritage buildings.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="264" ind1=" " ind2="1">
      <marc:subfield code="a">[Gatineau, Québec] : </marc:subfield>
      <marc:subfield code="b">Public Services and Procurement Canada = Services publics et approvisionnement Canada, </marc:subfield>
      <marc:subfield code="c">September 2026.</marc:subfield>
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      <marc:subfield code="c">©2026</marc:subfield>
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      <marc:subfield code="a">1 online resource (30 pages) : </marc:subfield>
      <marc:subfield code="b">illustrations, graphs, photographs</marc:subfield>
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      <marc:subfield code="a">Title from cover.</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Améliorer l'étanchéité à l'air des édifices patrimoniaux : guide abrégé des pratiques exemplaires en matière d'essais d'étanchéité à l'air appliqués aux édifices patrimoniaux.</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 27).</marc:subfield>
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      <marc:subfield code="a">"Building on a previous collaboration between the National Research Council of Canada and Public Services and Procurement Canada, the guide Making Heritage Buildings More Airtight: Best Practice Guide for Testing and Modelling Airtightness of Heritage Buildings addresses the challenges of airtightness testing in heritage buildings, and how airtightness testing results can inform and advance whole building energy modelling during a rehabilitation project"--Purpose, page 1.</marc:subfield>
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      <marc:subfield code="a">Historic buildings</marc:subfield>
      <marc:subfield code="x">Conservation and restoration</marc:subfield>
      <marc:subfield code="z">Canada.</marc:subfield>
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      <marc:subfield code="a">Buildings</marc:subfield>
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      <marc:subfield code="x">Airtightness.</marc:subfield>
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      <marc:subfield code="a">Canada. </marc:subfield>
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      <marc:subfield code="e">issuing body.</marc:subfield>
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      <marc:subfield code="t">Améliorer l'étanchéité à l'air des édifices patrimoniaux : </marc:subfield>
      <marc:subfield code="w">(CaOODSP)9.965405</marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
      <marc:subfield code="s">7.10 MB</marc:subfield>
      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2026/spac-pspc/P4-191-2026-eng.pdf</marc:subfield>
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