Too plenty dust or soot? We clean burners, adjust air-gasoline mix
https://augustegum740.theglensecret.com/is-it-time-to-replace-your-old-furnace-signs-you-shouldn-t-ignore-1
Too a lot dust or soot? We clear burners, adjust air-gasoline mixture, and update filters to improve air fine and decrease furnace residue buildup.