Abstract: A revolving door has opposed vertical sidewalls defining a passage space, opposed passage openings, and a door assembly including a vertical central axis and a plurality of door wings extending outwardly from the central axis. The opposed vertical sidewalls form opposed substantially flat surfaces. The plurality of door wings are adapted to eccentrically revolve about the vertical central axis, such that an outer extremity of at least one door wing is always in close sealing proximity with each of said opposed surfaces. Preferably, the sidewalls are comprised of opposed vertical substantially flat members. The door wings that eccentrically revolve within the passage space allow use of opposing substantially flat sidewalls in place of curved sidewalls.