Patent ID: 6890386

Claim:
An injector assembly for delivering gas to a substrate, comprising: at least two injectors positioned adjacent each other and spaced apart to form at least one exhaust channel therebetween; a mounting plate for securing the at least two injectors, wherein each of the at least two injectors being individually mountable to or removable from the mounting plate, and the mounting plate being provided with at least one exhaust slot in fluid communication with the at least one exhaust channel; and an exhaust assembly coupled to said mounting plate for removing gases from said injectors; wherein said at least two injectors includes: one or more inner injector positioned adjacent each other and spaced apart to form a first exhaust channel therebetween; and one or more end injector positioned adjacent and outside of the one or more inner injector and spaced apart to form a second exhaust channel therebetween; and wherein said exhaust assembly includes: an inner exhaust manifold assembly in fluid communication with said first exhaust channel; and an outer exhaust manifold assembly in fluid communication with said second exhaust channel; and wherein said inner exhaust manifold assembly includes: a plate being provided with a plurality of through passages therein; a plurality of tubes coupled to each of said plurality of the through passages; and a balancing unit having a plurality of inlets for each of the tubes and a single outlet, wherein said balancing unit is further provided with plurality of channels connecting said plurality of inlets and the single outlet.