Forced air furnaces have a filter mounted at the blower to eliminate dust from the air that the furnace moves through the home.
Clean the vent outlets around the house. Shop vac out any dust or debris from all the vents.
The burner flame needs to be uniform and blue while the furnace runs. If after cleaning you see a yellow flame, it indicates imporper combustion. Clean the burners more thoroughly and vac away any soot or debris. If the burner needs adjusting, consult a professional. This would involve tools that analyze the exhaust gases to determine the level of combustion. Most of us don’t have that sort of thing lying about! This will insure safe and effective use of your system.