Cleanroom pass-thru chamber and method of construction

A method of constructing a cleanroom pass-thru chamber comprising the steps of:

• bending a single sheet of material into a monolithic frame having a first side, an opposing second side, a third side extending between the first and second sides, an open front end and an open rear end, the first side defining a first lip at a free end thereof and the second side defining a second lip at a free end thereof, the first lip and the first side being bent to have a first coved corner therebetween, the first side and the third side being bent to have a second coved corner therebetween, the third side and the second side being bent to have a third coved corner therebetween, the second side and the second lip being bent to have a fourth coved corner therebetween, and the first lip and the second lip defining an open portion therebetween;
• attaching a first plate to the first lip and to the second lip, the plate extending, and closing the open portion of the monolithic frame, therebetween, and, in turn, forming an inner shell having a continuous periphery;
• positioning the inner shell within an outer frame, the outer frame having an open front end and an open rear end;
• attaching the inner shell to the outer frame;
• and
• attaching at least one of a front door to the open front end of the outer frame and a rear door to the open rear end of the outer frame.