Furnace Fan Blows

Can anyone help me.
The furnace fans blows for 20-30 mins after the heat shuts off. What is wrong with my furnace?
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Make and model number?
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snipped-for-privacy@hotmail.com wrote:

OP, did you check the filter? Did you do anything on furnace or thermostat? Other than blower running too long everything else is normal?
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The Fan/Limit switch is likely stcking. replace same with same.
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