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Hello TC, Thank you for reaching out to us about this amazing over the range microwave. This is a great question and we are more than happy to help with this. Microwaves have a fan where the internal components are located which will run continuously while the microwave is in operation to constantly circulate the air to cool the working parts. It is normal for the internal fan for the electronics to continue to run for a few seconds after the microwave cycle is complete, even if the door is opened. This fan does not circulate air in the cavity. There is also an exterior fan on over the range models such as this one. The fan will make noise similar to a vent hood. Note: This fan is controlled by a high/low/off switch but will automatically come on if the cooktop surface transfers significant heat to the microwave. The fan will not go off until the microwave thermostat reaches a lower temperature. These actions are both normal. We hope this information helps, feel free to reach out again with any other questions you may have. Have a great day!-Avery@GEA
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