The BS (IEC) Standards
For an end user it is not clear what the content of the IEC standards is, how to interpret the results, to what extend the manufacturers have reliable numbers, and finally if there is an external body that is controlling the manufacturers.
NeutraTEST knows the BS standards but we have chosen to let our tests reflect the real life mounting and utilization of your cooker hood. This means that our findings will be more severe than what you find on the spec sheets of the manufacturers – for example with regard to extracted air and the noise level.
Also for the about 100 manufacturers in the world it must be a jungle to find their way through the BS standards.
As an end user of cooker hoods it is close to impossible to check or understand the standards. The cost is prohibitive (more than 500£) and you must "be a company" to acquire them. Some of the standards only exist in English and knowledge of basic statistics is a must.
BS standards are only recommendations. If a cooker hood manufacturer choose to follow these recommendations it is
• Up to the manufacturers to have their equipment tested and agreed by independent test centers
• Or to apply local national rules that require and verify that the equipment is conform with the standards if such rules exist.
An overview of the standards
IEC 60704-1 is the basic test code for measuring acoustical airborn noise in household appliances. IEC 60704-2-13 ed2.0 (which only exists in English) tops the IEC 60704-1 with all the exceptions and additional elements that concern the cooker hoods. When putting into use IEC 60704-2-13 you will also have to acquire the ISO 3743-1, 3743-2 and 3755, the ISO 9614-1 and 9614-2, and ISO 7235. Finally the IEC 61591 is the international standard for measuring the extraction performance of the cooker (range) hoods.
Looking at the present complexity, when taking this wealth of information from the standards into account our ambition of transparency is well founded. We want to help you choose easily with rational arguments so you can be more comfortable afterwards when you live with your cooker hood for the next 10-20 years.