IEC 60704-2-7-2020 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE – Part 2-7: Particular requirements for fans

IEC 60704-2-7-2020 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE – Part 2-7: Particular requirements for fans. 1 Scope and object This clause of Part 1 is applicable except as follows: 1.1 Scope 1.1.1 General Replacement: This document applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for AC or DC supply. The motor, the impeller and their housing, if any, form a single unit. These particular requirements apply to: – conventional fans, – table fans, – pedestal fans, – ceiling fans, – bladeless fans, – wall bracket fans, – ceiling bracket fans, – louver fans, – tower fans, – ventilating and partition ventilating fans. This standard does not apply to: – fans that are part of a ventilation system, – fans designed exclusively for industrial purposes, – fans that are part of an appliance (for example cooling fans), – fans with additional functions (for example heating, humidifying). Limitations for the use of this test code are given in the scope of IEC 60704-1 . 1.1.2 Type of noise Replacement: The methods specified in ISO 3743-1 , ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by fans. 1.1.3 Size of source Replacement: The method specified in ISO 3744 is applicable to noise sources of any size. When applying ISO 3743-1 and ISO 3743-2, care should be taken to ensure that the maximum size of the appliance under test fulfils the requirements specified in 1 .2 of ISO 3743-1 :201 0 and 1 .3 of ISO 3743-2:1 994. 1.2 Object Addition: This document describes the determination of the noise emission of household fans in normal operation at maximum speed. Other speeds can, in addition, be used. Requirements for the declaration of noise emission values are not within the scope of this document. The aim of this document is to give direction for measuring the noise in a room resulting from the operation of a fan. NOTE 1 01 For determining and verifying noise emission values declared in product specifications, see IEC 60704-3. 1.3 Measurement uncertainty Replacement: The estimated values of standard deviations of sound power levels determined in accordance with this document are given in Table 1 01 : 2 Normative references This clause of Part 1 is applicable except as follows: SO 3743-1 :201 0, Acoustics – Determination of sound power...