Adopts ISO 12759:2010 to establish a classification of fan efficiency for all fan types driven by motors with an electrical input power range from 0.125 kW to 500 kW. This Standard is applicable to bare shaft and driven fans, as well as fans integrated into products.
Table of contents
Header
About this publication
Preface
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 Fans — General
3.2 Fan or test installation categories according to the arrangement of ducting
3.3 Fans — Definitions relating to calculations
3.4 Definitions relating to fan efficiency
3.5 Fan efficiency grades
4 Symbols and units
5 Fan installation, efficiency and tolerance
5.1 General
5.2 Use of installation categories
5.3 Calculation of efficiency
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.4 Tolerances
6 Ratings
6.1 General
6.2 Bare shaft fans
6.3 Driven fans
6.3.1 General
6.3.2 Axial, forward curved or radial-bladed centrifugal driven fans
6.3.3 Centrifugal backward-bladed fans (with and without housing) and mixed-flow driven fans
6.3.4 Cross-flow driven fans
Annex A
Annex B
B.1 General
B.2 Motor
B.3 Transmission
B.4 Controls
B.5 Worked example for a forward curved centrifugal fan
Annex C
Annex D
D.1 General
D.2 Power consumption calculations
D.2.1 General
D.2.2
D.2.3
D.2.4
D.2.5 Transmission power
D.2.5 Motor power
D.2.6 Controls/power loss
D.3 Mains power required
D.4 Presenting results of a typical induction motor and VFD while driving a fan
Annex E
Annex F
F.1 Calculation
F.1.1 Methodology for calculation of efficiency grade, NG
F.1.2 Application of the efficiency grade
F.2 Example of calculation of efficiency grades
F.2.1 Axial fan
F.2.2 Centrifugal bladed fan without housing — Plenum fan
