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Microwave appliances and methods for operating microwave appliances are provided. A method includes operating a fan of the microwave appliance in order to draw a flow of air through a circulation conduit of the microwave appliance, measuring an operational characteristic of the fan with a sensor of

Microwave appliances and methods for operating microwave appliances are provided. A method includes operating a fan of the microwave appliance in order to draw a flow of air through a circulation conduit of the microwave appliance, measuring an operational characteristic of the fan with a sensor of the microwave appliance during the operating step, and providing an indicator signal when the operational characteristic exceeds a threshold value at the measuring step.

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1. A microwave appliance, comprising: a magnetron for generating microwaves;a casing that defines a chamber configured for receipt of food items for cooking and a circulation conduit, the circulation conduit having an inlet and an outlet;a door mounted to the casing and configured for permitting sel

1. A microwave appliance, comprising: a magnetron for generating microwaves;a casing that defines a chamber configured for receipt of food items for cooking and a circulation conduit, the circulation conduit having an inlet and an outlet;a door mounted to the casing and configured for permitting selective access to the chamber of the casing;a fan positioned within the circulation conduit of the casing, the fan drawing a flow of air into the circulation conduit through the inlet of the circulation conduit when the fan is in an activated state;an air filter mounted to the casing such that the flow of air within the circulation conduit passes through the air filter when the fan is in the activated state;a sensor in operative communication with the fan for measuring an operational characteristic of the fan correlated to an estimated life of the air filter, the operational characteristic including a total time that the fan has been in the activated state and a total number of times that the fan has been placed in the activated state; anda controller in operative communication with the sensor, the controller configured to provide an indicator signal when the operational characteristic exceeds a threshold value. 2. The microwave appliance of claim 1, wherein the total time that the fan has been in the activated state includes every length of time that the fan is activated, and wherein the total number of times that the fan has been placed in the activated state is a measure of every time that the fan is activated. 3. The microwave appliance of claim 1, wherein the total time that the fan has been in the activated state is a measure of every length of time that the fan is activated until reset by a user. 4. The microwave appliance of claim 1, wherein the sensor further monitors a speed setting of the fan. 5. The microwave appliance of claim 1, wherein the indicator signal is an air filter change signal. 6. The microwave appliance of claim 1, wherein the air filter is positioned within the circulation conduit of the casing at the outlet of the circulation conduit. 7. The microwave appliance of claim 1, wherein the air filter comprises a charcoal air filter, a high-efficiency particulate air filter, or an electrostatic air filter. 8. The microwave appliance of claim 1, further comprising a grease filter positioned within the circulation conduit of the casing at the inlet of the circulation conduit, the air filter positioned downstream of the grease filter. 9. A method of operating a microwave appliance, comprising: operating a fan of the microwave appliance in order to draw a flow of air through a circulation conduit of the microwave appliance, the microwave appliance including a magnetron for generating microwaves;measuring an operational characteristic of the fan correlated to an estimated life of the air filter with a sensor of the microwave appliance during the operating step; andproviding an indicator signal when the operational characteristic exceeds a threshold value at the measuring step;wherein the operational characteristic includes a total time that the fan has been in the activated state and a total number of times that the fan has been placed in the activated state. 10. The method of claim 9, wherein the total time that the fan has been in the activated state includes every length of time that the fan is activated, and wherein the total number of times that the fan has been placed in the activated state is a measure of every time that the fan is activated. 11. The method of claim 9, wherein total time that the fan has been in the activated state is a measure of every length of time that the fan is activated until reset by a user. 12. The method of claim 9, further comprising monitoring a speed setting of the fan with the sensor. 13. The method of claim 9, wherein the indicator signal is an air filter change signal. 14. The method of claim 9, wherein said step of operating comprises operating the fan of the microwave appliance in order to draw the flow of air through the circulation conduit of the microwave appliance and an air filter of the microwave appliance. 15. A microwave cooking appliance, comprising: a magnetron for generating microwaves;a casing that defines a chamber configured for receipt of food items for cooking and a circulation conduit, the circulation conduit having an inlet and an outlet;a door mounted to the casing and configured for permitting selective access to the chamber of the casing;a fan positioned within the circulation conduit of the casing, the fan drawing a flow of air into the circulation conduit through the inlet of the circulation conduit when the fan is in an activated state;an air filter mounted to the casing such that the flow of air within the circulation conduit passes through the air filter when the fan is in the activated state;a sensor in operative communication with the fan for measuring an operational characteristic of the fan, the operational characteristic of the fan correlating to an estimated life of the air filter and including a total time that the fan has been in the activated state and a total number of times that the fan has been placed in the activated state; anda controller in operative communication with the sensor, the controller configured to provide an indicator signal when the operational characteristic exceeds a threshold value. 16. The microwave cooking appliance of claim 15, wherein the indicator signal is an air filter change signal.