The human vertebral column is the vertebral column (backbone or spine) of the human skeleton, consisting of 24 articulating vertebrae and 9 fused vertebrae in the sacrum and the coccyx.he human vertebral column is the vertebral column (backbone or spine) of the human skeleton, consisting of 24 articulating vertebrae and 9 fused vertebrae in the sacrum and the coccyx.
ADA Clear Doorway widths. Two doors in series must have a minimum of 48â in addition to the width of the door(s) swinging into the space (so a 36â door swinging into a hall would require the hall to be a minimum of 7â-0â long before any other door could be placed, if the second door does not also swing into the hall).
ADA/ANSI Guidelines: 1  Clear openings of doorways with swinging doors shall be measured between the face of door and stop, with the door open 90 degrees. (ANSI 404.2.3) 2  When a passage exceeds 24 in depth, the minimum clear opening increases to 36. (ANSI A117.1 404)