It is recommended that the designation of areas to be used as tornado shelters be in accordance with the following criteria:
(a) Whenever possible, designate areas which are located below ground level, in the core of the building, in rooms or spaces with short ceiling spans, and on the leeward side. The farther the area is below ground level, the greater the protection. In any event, the area should be on the lowest floor, in the center of the building, and in a corridor or small room.
(b) First aid kits and supplies should be in or close to the tornado shelter area(s).
(c) Avoid walls of glass, windows, skylights, and areas containing trophy cases or other fixtures of glass.
(d) Avoid load-bearing walls and exterior walls, especially those on the windward side or facing the south, southwest, or west.
(e) Avoid corridors which are not baffled with a wall or walls and that open to the south, southwest, or west.
(f) Avoid an area with only one exit, unless overriding considerations should prevail.
(g) Avoid rooms or areas which are locked, since they may not be readily accessible during an emergency.
(h) Avoid, absolutely, chimneys and the use of cars, buses, and modular classroom buildings.
(i) Avoid rooms or spaces with long ceiling spans, that are opposite openings or doorways that lead into rooms with windows in exterior walls, or that are within the unprotected, falling radius of higher building components.