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ASHRAE 120-2017
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ASHRAE 120-2017 Standard 120-2017 -- Method of Testing to Determine Flow Resistance of HVAC Ducts and Fittings (ANSI/ASHRAE Approved)
standard by ASHRAE, 2017
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Full Description
Standard 120 establishes uniform methods of laboratory testing of HVAC ducts and fittings to determine their resistance to airflow. This 2017 revision of the standard increases the length upstream of the test duct or fitting from 10 to 15 hydraulic diameters.