A device for channeling boiler flue gas flow and injecting controlled amounts of ammonia upstream of a selective catalytic reduction NOx removal system. The system is provided with a pressure relief valve to divert fuel from the fuel line during engine shut down conditions when fuel flow to the engine is not desired. The method includes a plasma formed by energy provided from two separate power sources and a gaseous mixture that includes only an etchant gas and a sputtering gas. The tube and pegs cooperate to transmit the rotational and vertical movement of the tower top to the collapsible stairs.