Answer :

Mid rails must be installed halfway between the top of the guardrail and the work surface.

The mid rails or intermediate rails must be installed at the middle level between the top the guardrail and the work surface, if there is no wall or parapet at least 21 inches as per the guidelines developed by OSHA (Occupational Safety and Health Administration). A mid rail is a dividing rail that separates the top portion of the guardrail from the bottom portion of a work surface. Solid panels, screens, mesh, intermediate vertical members, or other equivalents can be considered as mid rails as per the guidelines.

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