Opening Limitations in Risers

In commercial buildings, openings between treads are not permitted on stairways that are part of an accessible means of egress. Other stairways in public portions of buildings must prohibit the passage of a 4-inch-diameter sphere.
In commercial buildings, openings between treads are not permitted on stairways that are part of an accessible means of egress. Other stairways in public portions of buildings must prohibit the passage of a 4-inch-diameter sphere.

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