Buday, it sounds like the blower fan and motor needs cleaning and oiling. This should be done annually and you can do it yourself. This should quite things down a bit.
According to your Owners Manual, here's what you need to do.
Servicing and Oiling the Fan Motor:
The fan motor should be cleaned and oiled once each heating season.
To reach the motor, withdraw the metal shroud surrounding the fan
blade by removing the screws on each side. Oil holes are located
on the top at each end of the motor. Use a few drops of #10 motor
oil. To clean the motor, blow air through its ventilation openings
with a vacuum cleaner or low pressure air source (canned air with a
straw nozzle like you clean your computer with works well).
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