Authentic HERMAN MILLER Aeron Chair Size A (small). This chair is of great quality and is in good condition and is Made In The USA from quality materials. A true American Classic. Model: AERON Size A. Seat Height: 14.4-19.5. Seat Depth: 15.75. Back Width: 14.8. Note: 11/5/24 – To set the Forward tilt one has to reduce the back tilt tension and then lean back and then pull up all the way on the forward tilt lever. This technique is documented in numerous videos which can be found on You Tube.