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A controller in the form of an insert for a microwave oven having apertures or openings therein, each of which is provided with an adjustable closure for controlling the amount of radiation reaching food being heated or cooked in the oven. The controller unit includes a radiation-opaque shield or pa

A controller in the form of an insert for a microwave oven having apertures or openings therein, each of which is provided with an adjustable closure for controlling the amount of radiation reaching food being heated or cooked in the oven. The controller unit includes a radiation-opaque shield or panel supported in elevated relation to the bottom of the microwave oven with the apertures being provided in the panel at desired positions with the apertures being of different sizes and having closure members to enable the size of the apertures to be varied for more effectively controlling the amount of radiation engaging food products placed under the controller. A positioning attachment is provided for the controller unit to enable it to be placed accurately in the oven and to adjust the controller to a proper position for various commercially available microwave ovens. An interior size adjustment element positioned within the controller permits use of standard service plates of any size and combinations of serving dishes, saucers, and the like. Two or more of the controller units may be connected together for use in a large oven. The open front of the controller is closed by two alternative methods to retain steam and prevent food soiling in the oven.

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