Ans: First, find the kitchen area, and based on the number of times you want the air in the kitchen to be cleaned, the calculation needs to be done. Example: If your kitchen size is 10 x 10 x 10, i,e 1000 cubic ft. and you want the air to be cleaned 10 times in an hour, then, the suction need is 1000 x 10 = 10,000 cubic ft/ hr or approximately 280 cubic meter/hr. Besides this, you must be aware of the fact that the more you are engaged in deep frying activities, the higher has to be the suction power.