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ANSI/ASHRAE Standard 120-2017

Method of Testing to Determine Flow Resistance of HVAC Ducts and Fittings

Establishes uniform methods of laboratory testing of HVAC ducts and fittings to determine their resistance to airflow. Used to determine the change in total pressure resulting from airflow in HVAC ducts and fittings, and the test results can be used to determine duct flow losses in pressure loss per unit length. Fitting losses are reported as local loss coefficients. Does not cover interpretation of test data. SI units of measurement only.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ASHRAE]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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