Another option for getting the passenger some air would be to put a T-shaped plug on the end of that pipe coming out of the glove box... divert the air both to the left and to the right instead of sending it straight out. Each passenger gets 50% of the available air.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL