1.1.1 General These particular requirements apply to refrigerators, frozen-food storage cabinets and food freezers (fitted with their accessories) for household and similar use, supplied from the mains or from batteries. 1.1.2 Types of noise The methods specified in ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by refrigerators, frozen-food storage cabinets and food freezers. 1.1.3 Size of the source 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 refrigerator, frozen-food storage cabinet or food freezer under test fulfils the requirements specified in 1.3 of ISO 3743-1 and ISO 3743-2. 1.2 Object These described methods are specified for appliances without an operator present. Requirements for the declaration of noise emission values are not within the scope of this standard. NOTE 101 For determining and verifying noise emission values declared in product specifications, see IEC 60704-3. 1.3 Measurement uncertainty The estimated values of standard deviations of sound power levels determined according to this standard are indicated in Table 101. 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 indicated in Table 102 apply.