How many degrees must a door open to correctly measure the clear openings of doorways with swinging doors?

To correctly measure the clear openings of doorways with swinging doors, the door must be opened to a full 90 degrees. This allows for a complete assessment of the doorway's dimensions without any obstruction, ensuring that the maximum width is visible for evaluation. At this angle, the path of the door is entirely out of the way, enabling inspectors to clearly ascertain compliance with accessibility standards and building codes. Opening the door to 90 degrees provides the most accurate representation of how unobstructed the opening is, which is essential for safety and accessibility considerations in commercial buildings.