Floor opening may be defined as a type of hole that should be at least of twelve inches in the platform, yard or floor in which something can fall. These are especially made for the exit and entry of the humans to fix something under or above the platform. So, the floor opening has been described in the definition.
Further explanation:
The floor opening has fixed dimension in inches and present on any floor or pavements. It is occupied by the waiter or conveyors.
The vertical barrier must be elevated or erected on the edges of the floor opening. This erection is known as standard railing.
The floor opening must be protected by the toe-board, railing and the width must be less than the twenty inches.
Different types of floor opening are ladder way floor opening, hatchway floor opening, skylight floor opening and manhole floor opening.
The floor opening material must be trench and designed in such a way that it can at least carry a truck of around two thousand pounds.
The mounting of the handrails of the floor opening must be designed in such a way that it can withstand and bear a weight of at least two hundred pounds.
A floor opening is an opening or entry or hole that is at least 12 inches or more than that in the pavement, yard, platform, floor or anything in which someone or something can fall in it.
It is made for the entry or exit of person to fix anything under or above this pavement or platform. The best example of these floor openings is stair or ladder pit, manway hole, or hatchway.
Thus, the correct answer is opening - floor opening.
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