Two excellent men, Peter and Nate, helped me with other issues on my furnace such as the filter to the furnace humidifier and a bathroom fan that wasn’t working. I called Safety King from another company suggestion. I needed an inspection of the neighbors smoke filtering into my condo unit. They made their comments to the management company of the condos. I am making an appointment for duct cleaning for April when spring is in the air. Very knowledgeable, respectful and courtesy, for the problem.