Report - HVAC 1st Cost Savings of 4/2 ACH vs. 8 ACH · 2013. 9. 20. · HVAC 1st Cost Savings of 4/2 ACH vs. 8 ACH DBC at 4/2 ACH vs. 8 ACH reduces peak HVAC airflow by 20% or ~ $512K. Net

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