ISO 12759-2:2019 PDF

Fans — Efficiency classification for fans — Part 2: Standard losses for drive components

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Title (English):

ISO 12759-2:2019

Fans — Efficiency classification for fans — Part 2: Standard losses for drive components

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 21
Publication date:: March 20, 2019
Edition:: ISO IS 12759 edition 1 version 1
ICS:: 23.120

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Description (English):

This document establishes a classification for fan efficiency. It applies to all electric-motor-driven fan systems that utilize a specific combination of components as defined below: a) fan airflow performance determined in accordance with an accepted performance standard; b) polyphase induction motors with nominal motor efficiency specified in this document; NOTE 1 Other types of motors are explicitly excluded. c) pulse-width modulated variable frequency drives (VFDs) for use with single motors; NOTE 2 Single VFDs that service multiple, parallel fan motors are excluded. d) mechanical power transmissions that utilize V-belts, flat belts, cog belts or couplings.

Technical details

Technical committee: ISO/TC 117 - Fans
SKU: ISO 12759-2:2019

Abstract

Overview

ISO 12759-2:2019 - Fans - Efficiency classification for fans - Part 2: Standard losses for drive components provides a standardized method to estimate the input power and overall efficiency of electric-motor-driven fan systems when direct measurement is impractical. The document models commonly used drive components (fan, motor, motor controller/VFD, mechanical transmissions) so users can compare alternative fan system configurations consistently.

Key topics and requirements

Scope and applicability
- Applies to fan systems with: fan airflow performance per accepted test standards, polyphase induction motors (nominal motor efficiency specified in the standard), pulse-width modulated VFDs for single motors, and mechanical transmissions using V‑belts, synchronous (cog/timing) belts or couplings.
- Other motor types and certain multi-motor VFD arrangements are explicitly excluded in the scope.
Component modeling and calculations
- Starts from the fan input power (determined per ISO 5801 / ANSI/AMCA test methods) and progresses through transmission, motor and controller losses to calculate overall system efficiency.
- Defines transmission efficiencies for V‑belt, synchronous belt and coupling arrangements and a direct‑coupled assumption (η = 1).
- Provides methods to estimate motor and VFD combined efficiency, using motor rated full‑load efficiency and load ratios, with coefficients and performance constants supplied in normative annexes.
Annexes and data
- Several informative and normative annexes supply performance constants and regional motor efficiency references (including IEC 60034‑30‑1 guidance, and annexes for horsepower/kW motor and VFD constants).
- Requires reporting of calculated fan system input power and efficiencies in a standardized way.

Applications and who uses it

Fan manufacturers and OEMs - to present consistent efficiency classifications for fan products and integrated systems.
Specifiers and consultants - to compare alternative fan, motor and drive configurations during system selection or retrofit design.
Energy auditors and facility managers - to estimate system losses and prioritize upgrades (e.g., VFD selection, belt upgrades).
Regulatory bodies and procurement teams - to define minimum expected performance and ensure consistent efficiency claims.

Related standards

ISO 12759 series (other parts)
ISO 5801 (fan performance testing)
ISO 13348 (fan data presentation)
ANSI/AMCA 230 and ANSI/AMCA 260 (fan test methods)
IEC 60034‑30‑1 (motor efficiency classes)

ISO 12759-2:2019 is a practical tool for anyone needing reproducible, comparable fan system efficiency estimates that incorporate realistic drive component losses.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Scope and applicability
- Applies to fan systems with: fan airflow performance per accepted test standards, polyphase induction motors (nominal motor efficiency specified in the standard), pulse-width modulated VFDs for single motors, and mechanical transmissions using V‑belts, synchronous (cog/timing) belts or couplings.
- Other motor types and certain multi-motor VFD arrangements are explicitly excluded in the scope.
Component modeling and calculations
- Starts from the fan input power (determined per ISO 5801 / ANSI/AMCA test methods) and progresses through transmission, motor and controller losses to calculate overall system efficiency.
- Defines transmission efficiencies for V‑belt, synchronous belt and coupling arrangements and a direct‑coupled assumption (η = 1).
- Provides methods to estimate motor and VFD combined efficiency, using motor rated full‑load efficiency and load ratios, with coefficients and performance constants supplied in normative annexes.
Annexes and data
- Several informative and normative annexes supply performance constants and regional motor efficiency references (including IEC 60034‑30‑1 guidance, and annexes for horsepower/kW motor and VFD constants).
- Requires reporting of calculated fan system input power and efficiencies in a standardized way.

Applications and who uses it

Fan manufacturers and OEMs - to present consistent efficiency classifications for fan products and integrated systems.
Specifiers and consultants - to compare alternative fan, motor and drive configurations during system selection or retrofit design.
Energy auditors and facility managers - to estimate system losses and prioritize upgrades (e.g., VFD selection, belt upgrades).
Regulatory bodies and procurement teams - to define minimum expected performance and ensure consistent efficiency claims.

Related standards

ISO 12759 series (other parts)
ISO 5801 (fan performance testing)
ISO 13348 (fan data presentation)
ANSI/AMCA 230 and ANSI/AMCA 260 (fan test methods)
IEC 60034‑30‑1 (motor efficiency classes)

ISO 12759-2:2019 is a practical tool for anyone needing reproducible, comparable fan system efficiency estimates that incorporate realistic drive component losses.

ISO 12759-2:2019 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

Fans - Performance testing using standardized airways - Amendment 1 (ISO 5801:2017/Amd 1:2025)

Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC motors (IE code)

Fans - Efficiency classification for fans - Part 5: Jet fans (ISO 12759-5:2021)

Industrial fans — Tolerances, methods of conversion and technical data presentation