AS/NZS ISO 12759.4:2023 identically adopts ISO 12759 4:2019, which establishes a system for the classification of fan efficiency for all fan types driven by motors of nominal rating 0.125 kW and above. It applies to driven fans only, but not to the system in which they might be installed. This document describes a number of different procedures to classify the efficiency of a fan or to apply a minimum efficiency limit (MEL)
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 General information
5.1 General
5.2 Use of installation categories
5.3 Efficiency calculation
5.4 Tolerances
6 Ratings
6.1 General
6.2 Driven fans
6.3 Axial, forward curved centrifugal, radial and mixed flow driven fan efficiency grades
6.4 Centrifugal backward bladed fan with and without housing driven fan efficiency grades
6.5 Cross flow driven fan efficiency grades
Annex A
A.1 Determination of efficiency grade for a driven fan
