Equations for redesign of existing ventilation systems

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      <subfield code="a">Redesign of poorly functioning industrial ventilation systems has been largely by trial and error. Equations for redesign calculations have been derived to predict necessary replacement duct sizes to achieve a target duct velocity, airflow or static pressure. Other equations predict effects of changing duct size on duct velocity, airflow, and static pressure</subfield>
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      <subfield code="g">Vol. 44, nº 11, 1983 ; p. 819-827</subfield>
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