Tricity Bendix CH 550 is a canopy cooker hood that can be operated in two modes – extraction or recirculation, depending on your kitchen setup. In the extraction mode, the hood sucks up the fumes and odors produced during cooking and expels them outside. In the recirculation mode, the hood draws in the fumes and odors, passes them through a charcoal filter to remove impurities, and then circulates the cleaned air back into the kitchen.