This clause of Part1 is applicable except as follows: 1.1 Scope 1.1.1 General Addition: These particular requirements apply to electrical range hoods and other cooking fume extractors for household and similar use intended for filtering the air of a room or for exhausting the air out of a room, including their accessories and their component parts. It also applies to cooking fume extractors with an external fan which may be mounted inside or outside of the room where the range hood is located or a down-draft system that is arranged beside, behind or under the cooking surface. 1.1.2 Types of noise Replacement: The methods specified in ISO3743‑1 , ISO3743‑2 and ISO3744 can be used for measuring noise emitted by cooking fume extractors. 1.1.3 Size of source Replacement: The method specified in ISO3744 is applicable to noise sources of any size. When applying ISO3743‑1 and ISO3743‑2 , care should be taken that the maximum size of the cooking fume extractor under test fulfils the requirements specified in 1.2 of ISO3743‑1 and 1.3 of ISO3743‑2 . 1.2 Object Addition: This standard describes the determination of the noise emission of household cooking fume extractors under normal operating conditions and at the highest fan speed setting for normal use. NOTE101 If a boost position is incorporated, this is not taken into account (see 6.5 of IEC61591:1997 ). NOTE102 A boost position is a setting of a control for occasional use, which results in a higher temporary fan speed (see 6.5 of IEC61591:1997 ). Requirements for the declaration of noise emission values are not within the scope of this standard. NOTE103 For determining and verifying noise emission values declared in product specifications, see IEC60704‑3 . 1.3 Measurement uncertainty Replacement: The estimated values of standard deviations of sound power levels, determined according to this standard, are as follows (see Table101): Table101 Standard deviations of sound power levels Standard deviation (dB) σ r (repeatability) σ R (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 IEC60704‑3 , the following values apply (see Table102): Table102 Standard deviations for declaration and verification Standard deviation (dB) σ P (production) σ t (total) σ M (reference) 1,5 to 1,7 1,8 to 2,0 2,0