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Are you referring to the copper colored gasket around the door frame ??.. that's the only thing I can see that looks like copper... it's a gasket for the door to seal to...
It appears to be connected to the blower motor... that might be what controls the "flow through" air supply... in place of "convection" air flow.... So you would have regulated positive displacement air flow..... How cool is that...... answer: real cool......