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Air Changes (ACH) Calculator
ACH plus the ASHRAE 62.2 ventilation target.
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Duct airflow calculators
Focused screening tools for duct airflow.
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CFM Airflow Calculator
Required CFM from BTU load and temperature split.
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CFM per Ton Calculator
Blower airflow across the 350-450 range.
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Duct Size Calculator
Round duct diameter from CFM and design velocity.
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Rectangular Duct Equivalent Calculator
Huebscher round equivalent for rectangular duct.
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Return Air Size Calculator
Return grille and duct size that will not starve the blower.
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