HVAC, Refrigeration & Building Science

Duct Design & Static Pressure Calculators

Sizing round and rectangular ducts, computing friction loss and available static pressure, and verifying duct leakage the way Manual D and ASHRAE do it.

2 calculators in this category

Duct Size Calculator (Equal Friction & Velocity Method)ASHRAE / ACCA Manual D friction equationEnter the airflow a duct has to carry and the friction rate your design allows, and this calculator returns the round diameter…
Available Static Pressure & Friction Rate CalculatorACCA Manual D friction rate procedureA blower produces a fixed amount of static pressure at its design airflow, and the filter, coil, humidifier, grilles and…

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