The invention encompasses a radiation-patterning tool. When media protection is requested, the network element and an intermediate network element such as media proxy establish a connection providing media protection over the access network. The air curtain guides the gas and fumes toward the exhaust flow path of the wall-mounted microwave oven so as to effectively exhaust the gas and fumes to the outside. The second first-type MOSFET includes a second gate structure, a second source area, and a second drain area on the substrate.