A shelf is a flat horizontal plane which is used elsewhere to hold items of value that are being displayed or stored. Shelving is typically raised off the ground and usually anchored/supported on its shorter length sides by brackets. It can also be held up by columns or pillars.
A shelf can be attached to a wall or other vertical surface, be suspended from a ceiling, be a part of a free-standing frame unit, or it can be part of a piece of furniture such as a book case or entertainment center.
Usually two to six shelves make up a unit, each shelf being attached perpendicularly to the vertical or diagonal supports and positioned parallel one above the other. Free-standing shelves can be accessible from either one or both longer length sides. A shelf with a hidden internal bracket is termed a floating shelf.
The length of the shelf is based upon the space limitations of its sitting and the amount of weight which it will be expected to hold. The vertical distance between the shelves is based upon the space limitations of the unit’s sitting and the height of the objects; adjustable shelving systems allow the vertical distance to be altered. The unit can be fixed or be some form of mobile shelving. The most heavy duty shelving is pallet racking.
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