ISO 13347-1:2004/Amd 1:2010

Overview

ISO 13347-1:2004/Amd 1:2010 is an essential amendment to the international standard that governs the determination of sound power levels of industrial fans under controlled laboratory conditions. This amendment provides a general overview and refines guidelines related to the measurement of fan noise emissions, ensuring consistency and accuracy in acoustic testing. The standard is issued by ISO, the International Organization for Standardization, specifically under Technical Committee ISO/TC 117, which focuses on fans.

The amendment updates measurement practices, particularly emphasizing sound power levels at low-frequency octave bands, such as 63 Hz, which are critical for some centrifugal fans. It aligns with established laboratory acoustic standards, helping manufacturers, testing laboratories, and regulatory bodies maintain uniformity and reliability in fan noise evaluations.

Key Topics

• Standardized Laboratory Conditions
  ISO 13347-1:2004/Amd 1:2010 enforces testing performance in strictly controlled environments to minimize variability and ensure reproducibility of fan sound power level measurements.

• Octave Band Frequency Range
  The amendment clarifies acceptable frequency bands for measurements, traditionally from 125 Hz to 8,000 Hz. It introduces guidance allowing expansion down to 63 Hz octave bands under specific conditions, addressing noise contributions from certain centrifugal fans.

• Measurement Uncertainty at Low Frequencies
  Highlighting the challenge of accurately measuring sound at lower frequencies, the standard advises that extreme care and high accuracy instruments are necessary when extending tests below 125 Hz, and results should preferably focus on 125 Hz and above for general purposes.

• Alignment with ISO 3740 Series
  It references related standards like ISO 3740:2000 to provide supplementary data and supports practical application by integrating these internationally recognized acoustic measurement guidelines.

• Revision and Notes Renumbering
  The amendment modifies certain notes in the original clause 5 to enhance clarity and update reference standards.

Applications

• Industrial Fan Manufacturing
  Fan manufacturers utilize this standard to assess noise emissions during design and production, ensuring products meet environmental noise regulations and improving acoustic performance.

• Acoustic Testing Laboratories
  Laboratories adopt the amended procedures to validate and certify the sound power levels of fans, enabling consistent international compliance and reliable data reporting.

• Environmental Noise Assessment
  Regulatory agencies and environmental consultants reference this standard to evaluate noise pollution from industrial ventilation systems, supporting health and safety standards.

• Product Development and Quality Control
  R&D teams integrate standardized acoustic measurements for product optimization, validating fan performance with respect to noise before market release.

Related Standards

• ISO 3740 Series - Covers basic environmental and laboratory conditions for acoustic measurements, providing essential methods and reference values that complement ISO 13347-1.

• ISO 3743-2 and ISO 3744 - Standards detailing specific procedures for sound power determination in laboratory and semi-anechoic conditions relevant to fan noise testing.

• ISO/IEC Directives, Part 2 - Framework for drafting international standards, ensuring the methodological integrity of ISO 13347-1 and its amendments.

Keywords: industrial fans, fan sound power levels, standardized laboratory conditions, fan noise measurement, ISO 13347-1 amendment, acoustic testing, centrifugal fans, low-frequency noise, octave bands, ISO fan standards.