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2010 ADA Standards for Accessible Design Pocket Guide

404.2.6 Doors in Series and Gates in Series.

The distance between two hinged or pivoted doors in series and gates in series shall be 48 inches (1220 mm) minimum plus the width of doors or gates swinging into the space.

Figure (a) shows two doors in series which swing in the same direction.  Space between the doors must be at least 48 inches (1220 mm) minimum plus the width of the in-swinging door.
Figure (b) shows two doors in series which swing away from the space between the doors.  The space separating the doors must be at least 48 inches (1220 mm) long.
Figure (c) shows two doors in series which swing into the space between the doors.  The space between the fully opened doors must be at least 48 inches (1220 mm) long.

Figure 404.2.6 Doors in Series and Gates in Series

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