Ventilation & Airflow

Ventilation and airflow calculators help HVAC engineers size ductwork, determine outdoor air requirements, and evaluate fan performance. This section includes tools for calculating CFM based on air changes per hour, determining sensible heat loads from outdoor air intake, sizing ducts for target velocity or friction rate, and computing fan energy index values for code compliance. These calculators are used during system design to ensure that ventilation rates meet ASHRAE 62.1 and local code requirements while maintaining acceptable noise levels and static pressure. They are equally useful during commissioning and balancing when measured airflows need to be compared against design values. Each tool applies standard industry methods so results are directly comparable to equipment ratings and engineering specifications.