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The baffle may help to distribute the microwaves evenly around the ov=
en, or to keep splattered food out of the magnetron, or both. Microw=
ave ovens also often have fans in front of the magnetron opening into=
the oven cavity. The purpose of these isn't to cool the magnetron, b=
ut to serve as rotating microwave reflectors. These keep the oven fro=
m having "hot spots" and "cold spots" due to standing waves, and help=
the food cook more evenly.=20
Vickie