FIM is a company specialized in the design and production of kitchen hoods, also called "hoods" in Italian1. Their design process starts from the function of the hood, and the design helps to guarantee exceptional performance1. The FIM, Airworks product line testifies to their commitment to air treatment2. They constantly seek new solutions, materials and production processes, combining tenacity, concreteness and product dedication2. In the choice of a kitchen hood, beyond the aesthetic appearance, the determining element is the air flow rate, or the amount of air sucked from the appliance in an hour (M3 / H) 13. FIM hoods are designed to be connected to a 150 mm diameter duct, but for specific requirements there is a diameter reducer that also allows use of 120 mm3 diameter ducts.