Patent ID: 8186775

Claim:
An arm portal and pass box assembly for a controlled environment chamber comprising: a portal body comprising mechanical connection orifices formed therethrough a flanged portion of said portal body for said portal body's secure connection to a controlled environment chamber; a left-hand portal formed therethrough said portal body wherein said left-hand portal has a stepped left interior wall comprising a first inner section with a first inner diameter and a first outer section with a first outer diameter; a right-hand portal formed therethrough said portal body wherein said right-hand portal has a stepped right interior wall comprising a second inner section with a second inner diameter and a second outer section with a second outer diameter; a pass box formed thereon said portal body adjacent said right and left-hand portals; wherein said left-hand portal has no axis of symmetry and said right-hand portal has no axis of symmetry; a left single walled outer ring of uniform depth with a beveled exterior surface and front flange formed around its front edge; and a left double walled inner ring on non-uniform depth wherein said non-uniform depth increases from a bottom of said inner ring to a top of said inner ring and wherein only a back edge of said inner ring is tapered; and wherein said left single walled outer ring transitions together with said left double walled inner ring at an interface of the non-tapered front edge of said inner ring and the non-flanged rear edge of said outer ring.