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Donut

Provides airflow calculations for specifying mechanical ventilation in residential buildings.  Calculates required airflow based on conditioned area and occupancy using Joe Lstiburek's BSC01 2013 Ventilation Standard.  The effective airflow for installed fans is calculated using the nominal fan CFM along with duct configuration and controls
Duct configurations
The configuration of the fan duct work, specifically the orientation of the supply and return ducts to each other, determines the effectiveness of ventilation system. The duct effectiveness is multiplied by the average CFM (See Fan Controls below) to determine the effective CFM delivered to the Conditioned Space.
Fan Controls
The user can set the controls for all installed fans.  Controls options are: Always on or Programmable.  Programmable controls can be specified in minutes of runtime per hour or hours of runtime per day.  The Fan's nominal CFM rating is multiplied by the runtime fraction (hour/24 or min/60) to determine the average CFM of the fan.
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Airflow Calculator

Latest Version of Airflow Calculator