Fig. 2 illustrates the working principle of the novel range hoodproposed in this study. The electric motor drives the impeller athigh rotational speeds, resulting in a negative pressure zone atthe centre of the circular impeller. The COF passes through thehigh-speed rotating impeller under atmospheric pressure conditions.The impeller includes a number of arc blades evenlyarranged in the form of a ring and two plates – one annular structureto let COF in and one circular structure connecting it to theelectric motor axis. The diameter of the circular structure is largerthan that of the impeller and hence a diffuser region between theimpeller outlet and outer cylinder is formed. Under the action of acentrifugal force, the COF flows into the diffuser region wheredynamic pressure is converted into static pressure to improveimpeller efficiency. Later, the COF reaches the GVE zone wheregrease particles are separated from the airflow. Ultimately, the separatedCOF is discharged into the outside environment or into apublic flue system