MAXON Series HC AIRFLO^® Duct Burners provide the low NOx operation in fresh and re-circulating industrial air heating applications. Series “HC” AIRFLO^® low NOx Burners can operate in a process air stream with 12% or less oxygen content for optimal efficiency and reliability. The HC AIRFLO^® natural gas burner ensures efficient, flexible operation with lower pressure drops than other duct burners.