This clause of part 1 is applicable except as follows: 1.1 Scope 1.1.1 General Replacement: This standard applies to electric fan heaters, designed for placing on the floor, table or counter, etc., or for wall-mounting. This standard does not apply to electric storage room heaters; room humidifiers; room dehumidifiers; air cleaners; heaters designed exclusively for industrial purposes. 1.1.2 Types of noise Replacement: ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by fan heaters. 1.1.3 Size of the 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 Subclause 1.3 of ISO 3743-1 and ISO 3743-2. 1.2 Object Addition: The frequency range of interest for sound power determination on fan heaters includes at least the octave bands with centre frequencies from 63 Hz to 8000 Hz. NOTE 1 In many cases, the 63 Hz octave band level does not participate significantly to the A-weighted level. NOTE 2 When measuring this 63 Hz octave band, a special attention should be paid to the room effect. Requirements for the declaration of noise emission values are not within the scope of this standard. NOTE 3 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 standard, are as follows: Standard deviation, dB σr (repeatability) σR (reproducibility) 0,4 1,0 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 following values apply: Standard deviation, dB σP (production) σt (total) σM (reference) 0,3 – 1,1 1,0 – 1,6 1,5