Various methods and systems are provided for flowing fluid through a passageway block. The cloth layer has a first surface and a second surface. Additionally, the lower surface preferably includes an opening formed therethrough that cooperates with a firebox so that an interior of the firebox engages in fluid communication with the cooking enclosure via the opening. In some embodiments, the line is projected by a laser system. In a specific embodiment, the descriptor is for a known or unknown compound, e.