Patent ID: 6916360

Claim:
A method of filtering air for lithography processing, the method comprising: (a) passing an incoming air stream through an adsorption bed, (i) the incoming air stream comprising acidic contaminants, basic contaminants, and non-polar organic contaminants; (ii) the adsorption bed comprising a first adsorptive media adapted to removing at least the acidic contaminants from the incoming air stream, and a second adsorptive media adapted to removing at least the basic contaminants from the incoming air stream; (b) providing a clean air stream to the lithography process by: (i) removing the acidic contaminants from the incoming air stream; (ii) removing the basic contaminants from the incoming air stream from the incoming air stream having the acidic contaminants removed therefrom; and (iii) removing the non-polar organic contaminants from the incoming air stream.