Where any obstruction within 18 inches mm of the latch side of a doorway projects more than 8 inches mm beyond the face of the door, measured perpendicular to the face of the door, maneuvering clearances for a forward approach shall be provided. Raised thresholds and changes in level at doorways shall comply with Sections and Distance between two hinged or pivoted doors in series shall be 48 inches mm minimum plus the width of any door swinging into the space. The space between the doors shall provide a turning space complying with Section Handles, pulls, latches, locks, and other operable parts on accessible doors shall have a shape that is easy to grasp with one hand and does not require tight grasping, pinching, or twisting of the wrist to operate. Operable parts of such hardware shall be 34 inches mm minimum and 48 inches mm maximum above the floor.
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2009 ICC A117.1 Accessible and Usable Buildings and Facilities