DURABLE MICROWAVE OVEN DOOR.

A warning label is now required on all microwave ovens to alert the owner of the possibility of exposure to excessive microwave energy leakage. An exemption may be granted upon the determination that the oven will continue to comply with the leakage requirements under the adverse conditions called out in the label. These conditions relate to operating the oven with an object caught in the door or a damaged door. Amana Refrigeration, Inc. , has obtained an exemption for Models RR-7 and RR-9 Microwave Ovens. The design features of the Amana door and the extensive testing program to establish that the warning label is unnecessary are presented in detail. The door contains a quarter wavelength slotted choke filled with a dielectric. It is tuned to 2450 MHz. The ovens were tested to establish that use or abuse of the door seal according to the three parts of the warning label, does not increase the leakage above 5 mw/cm**2.