The entrance to the Kodesh was twenty cubits high and ten cubits wide. The wall at the entrance to the Kodesh was five cubits thick. Each of the four doors was five cubits wide and ten cubits high. * Two doors were affixed on the exterior side of the doorway and opened inward to cover the width of the doorway. The two other doors that were affixed on the interior opened inward into the Kodesh and covered the wall. In this manner, the doorway and the eastern wall of the Kodesh were entirely covered with gold. (Source: Midot 4:1). 
The Kodesh
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII