Please note that the values you are given by the program are not exact values, rather are simply approximate or guide values. Owing to the variety of duct systems on the market, approximate or guide values for standard duct systems are used when calculating the performance of the ventilation hood.
This program and the corresponding results therefore simply provide you with useful guidance. The decision as to which ventilation hood and duct system to use ultimately is based on a number of factors, especially the conditions locally, and should be made with knowledge of all the factors in consultation with a professional.
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