Patent ID: 8342165

Claim:
An appliance comprising: a housing defining therein an airflow channel which is in flow communication with outside of the appliance, the airflow channel comprising a common channel, the common channel defining therein an airflow direction and comprising a diverging section with a cross section which increases in size in the airflow direction, and a converging section with a cross section which decreases in size in the airflow direction, the converging section being upstream of and next to the diverging section; a first heating unit disposed in the housing, the first heating unit defining therein a first cavity; a second heating unit disposed in the housing, the second heating unit defining therein a second cavity; a first duct through which the first cavity is in flow communication with the common channel, the first duct comprising a first outlet end disposed at least partially in the diverging section; a second duct through which the second cavity is in flow communication with the common channel, the second duct comprising a second outlet end disposed in the diverging section; and a fan in flow communication with the common channel, wherein when energized, the fan generates an airflow in the common channel to create a Venturi effect in the diverging section so that exhaust air in the first and second cavities is drawn into the common channel.