Element frame assemblies containing monoliths

An element frame assembly for holding at least one monolith containing catalysts in the flow of exhaust gases from a combustion source, the element frame assembly comprising an element frame and four or more monoliths;

• the element frame comprising:
• two pairs of opposing walls, wherein the walls form a rectangular or square shape;
• an interior formed by the walls;
• an inlet end;
• and
• an outlet end;
• and
• one or more flanges that extend inwardly from the inlet end and or the outlet end perpendicular to the walls;
• the four or more monoliths each having a rectangular or square shape and comprising:
• an inlet;
• an outlet;
• four sides;
• and
• at least one catalyst effective in reducing the concentration of one or more gases in the exhaust gas;
• wherein the four or more monoliths are positioned in the interior of the element frame, at least four of the monoliths being located in a two-by-two matrix arrangement with each monolith being adjacent to two others;
• there being positioned on each of the at least four monoliths a first knit wire mesh bearing element that extends over edges of the monolith at its inlet and a second knit wire mesh bearing element that extends over edges of the monolith at its outlet;
• the first knit wire mesh bearing elements and the second knit wire mesh bearing elements being positioned between adjacent pairs of the at least four monoliths and between the at least four monoliths and adjacent walls of the element frame.