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Spiral stairs wind around a newel or the central pole. They typically have a handrail on the outer side only and on the inner side just the central pole. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area but have the disadvantage of being very steep
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Spiral stairs wind around a newel or the central pole. They typically have a handrail on the outer side only and on the inner side just the central pole. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area but have the disadvantage of being very steep