Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions .4 Symbols, abbreviated terms and subscripts 4.1 Symbols and abbreviated terms 4.2 Subscripts 5 General 6 Test configurations 6.1 General 6.2 Category A configuration 6.3 Category B configuration 6.4 Category C configuration 6.5 Category D configuration 6.6 Inlets and outlets 6.7 Fans with significant swirl 6.8 Airways 6.9 Test space 6.10 Leakage 6.11 Test report. 7 Carrying out the test 7.1 Working fluid 7.2 Rotational speed