UNE-EN IEC 60704-2-7:2020

This clause of Part 1 is applicable except as follows:

1.1 Scope

1.1.1 General

Replacement:

This standard applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for a.c. or d.c. supply.

Motor, 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 which are part of a ventilation system,

fans designed exclusively for industrial purposes,

fans which 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 that the maximum size of the appliance under test fulfils the requirements specified in 1.2 of ISO 3743-1:2010 and 1.3 of ISO 3743-2:1994.

1.2 Object

Addition:

This standard describes the determination of the noise emission of household fans in normal operation at maximum speed. Other speeds can be used in addition. Requirements for the declaration of noise emission values are not within the scope of this standard.

The aim of this standard is to measure the noise in a room resulting from the operation of the

fan.

NOTE 101 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 according to this document are given in Table 101:

Table 101 - Standard deviations of sound power levels

Standard deviation (dB)

Ãr (repeatability) ÃR (reproducibility)

0,4 1,0



Addition:

1.101 Standard deviation for declaration and verification

For the purpose of determining and verifying declared noise emission values according to

IEC 60704-3, the values in Table 102 apply:

Table 102 - Standard deviations for declaration and verification

Standard deviation (dB)

ÃP (production) Ãt (total) ÃM (reference)

0,5 to1,0 1,0 to1,4 1,5