This clause of Part 1 is replaced by the following. This International Standard deals with the safety of electrically operated commercial hoods intended for installation above commercial cooking appliances such as ranges@ griddles@ griddle grills and deep fat fryers@ and not intended for household use@ their rated voltage being not more than 250 V for single phase hoods connected between one phase and neutral@ and 480 V for other hoods. Only single complete units and hoods supplied as separate parts which when assembled form a complete working hood@ incorporating a fan@ are within the scope of the standard. NOTE 101 Hoods are used@ for example in restaurants@ canteens@ hospitals and commercial enterprises such as bakeries@ butcheries@ etc. The hood may be used above one or more appliance of the same or different types. So far as is practicable@ this standard deals with the common hazards presented by these types of appliances. NOTE 102 Attention is drawn to the fact that: ?? for hoods intended to be used in vehicles or on board ships or aircraft@ additional requirements may be necessary; ?? in many countries additional requirements including ventilation requirements are specified by the national health authorities@ the national authorities responsible for the protection of labour and similar authorities; NOTE 103 This standard does not apply to: ?? domestic range hoods (IEC 60335-2-31); ?? purpose-built hoods@ although this standard can be used as a guide (a purpose-built hood is either constructed on-site or specially constructed in the factory and is not mass produced); ?? hoods not incorporating a fan; ?? hoods designed exclusively for industrial purposes; ?? hoods intended to be used in locations where special conditions prevail@ such as the presence of a corrosive or explosive atmosphere (dust@ vapour or gas). NOTE 104 Requirements for hoods with externally mounted fans are under consideration.