What constitutes an enclosed or substantially enclosed space?
Enclosed – If premises have a ceiling or roof and, except for doors, windows or passageways, are wholly enclosed, whether on a permanent or temporary basis. Substantially Enclosed – If premises have a ceiling or roof, but have an opening in the walls, which is less than half of the total areas of walls. The area of the opening does not include doors, windows or any other fittings that can be opened or shut.
