Duct Sizing Chart CFM

There are a few things that one must keep in mind when using the chart below.

  1. This chart should not be used if you are designing a full duct system.
  2. This chart estimates the airflow for an average system.
  3. Use volume dampers for every branch to ensure proper distribution of air.

The duct sizes in the chart below have been based on a friction rate of around 0.10 inches per 100 feet of a lineal duct. These duct sizings should be more than sufficient residential air conditioning and furnace heating applications. Higher static pressures and larger air volumes should be dealt with on a job to job basis.

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