Foreword

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This document was prepared by Technical Committee ISO/TC 117, Fans.

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Introduction

This document aims to establish uniform methods for laboratory testing of air circulating fans to determine performance for rating.

1 Scope

This document specifies laboratory testing methods for electrically powered air circulating fan heads and ceiling fans when air is used as the test gas.

This document is applicable to air circulating fans with an input power greater than or equal to 125 W, except for ceiling fans that are larger than 1 800 mm, which do not have a lower input power limit. The diameter of the fan being tested is limited by the minimum dimensions as shown in the applicable test figures.

See annex A for information on common names used for various air circulating fans.

This document does not apply to:

jet fans;
powered roof ventilators, induced flow fans, laboratory exhausts;
positive pressure ventilators as defined in ISO 24660:2024 ;
compressors;
positive displacement machines.

2 Normative references

3 Terms and definitions

3.1 Air circulating fans

3.2 Fan performance variables

3.3 Force

3.4 General definitions

3.5 Psychrometrics

3.6 Test configuration

4 Symbols, abbreviated terms and subscripts

4.1 Symbols and abbreviated terms

4.2 Subscripts

5 Instruments and methods of measurement

5.1 Accuracy

5.2 Measurements to determine thrust and airflow rate

5.3 Power

5.4 Fan speed

5.5 Air density

6 Equipment and Setups

6.1 Allowable test setups

6.2 Load cell orientation

6.3 Minimum testable configuration

7 Observations and Conduct of Test

7.1 General test requirements

7.2 Data to be recorded

7.3 Test procedures

8 Calculations

8.1 Calibration correction

8.2 Ambient air density

8.3 Thrust

8.4 Area

8.5 Airflow rate

8.6 Power

8.7 Fan total pressure

8.8 Overall efficiency

8.9 Circulating fan efficacy

8.10 Ceiling Fan Energy Index (C)

8.11 Thrust efficiency ratio

9 Report and results of test

9.1 Test report and results of test

9.2 Personnel

10 Figures

Bibliography