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Historical
ANSI/ASHRAE Standard 41.7-2015 (R2018)
Standard Methods for Gas Flow Measurement
This standard applies to laboratory and field gas flow measurement for testing heating, ventilating, air-conditioning, and refrigerating systems and components. This standard is restricted to applications where the entire flow stream of gas enters and exits the gas flowmeter in a gas-only state during data recording with the following exceptions: This standard does not apply to airflow measurements at pressures within this range: –25 kPa to +25kPa (–100 in. H2O to +100 in. H2O) referenced to ambient pressure. Those measurements are within the scope of ASHRAE Standard 41.2; This standard does not apply to fan performance rating airflow measurements. Those measurements are within the scope of ASHRAE Standard 51; This standard does not apply to gaseous phase refrigerant mass flow measurements where the gas flow includes circulating lubricant. Those measurements are within the scope of ASHRAE Standard 41.10.
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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]