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Rangehoods General / Installation Tips How much air throughput do I really need? This depends on the size of the kitchen, as well as the type of cooking. Whilst there are more scientifically complex formulas and examples available, the below guidelines should serve as a reliable and simple initial ‘rule of thumb’: First, you should calculate the total air volume in the kitchen. In the above example, the total air volume would be (3.0 x 4.0 x 2.5 =) 30 m 3 . In order to maintain a good air quality in the kitchen, Miele recommends to replace this air volume at a rate of between 8 (for ‘European’ style cooking) and 12 (for ‘Asian’ style cooking) times per hour. Presuming the user of the above kitchen would predominantly do ‘Asian’ style cooking, Miele would recommend a rangehood which achieves an air throughput of at least (12 x 30 =) 360 m 3 /h. Contrary to a common misconception, the size of adjoining open plan living areas must NOT be taken into account: provided the rangehood will be installed and operated appropriately, the air movement it will generate will ensure that cooking vapours and other impurities in the air will effectively be retained in the active cooking area. Why a does a higher air throughput not necessarily guarantee better performance? Miele rangehoods are designed to provide the optimum balance between highly efficient vapour capture and removal, effective grease filtration and a pleasantly quiet operation. If the effective air throughput was much higher than what it really needs to be, this could lead to numerous problems including excessive air speed (which may prevent the grease filters from working effectively), as well as an increased operating noise. 206