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Getting the air adjustment on Beckett oil burners right is probably the quickest way to stop your furnace from acting like a soot-breathing dragon and start behaving like an efficient heating machine. If you've ever walked into your utility room and noticed a faint smell of oil or seen a weird dusty residue on top of the unit, there's a good chance your air-to-fuel ratio is out of whack. It's one of those maintenance tasks that feels a bit intimidating at first, but once you understand how the burner "breathes," it's a lot easier to manage. ...