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In case of _______ stair, there is a well or hole or opening between the flights in the plan.

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In case of _______ stair, there is a well or hole or opening between the flights in the plan.

(a) Spiral

(b) Three Quarter Turn

(c) Open Newel

(d) Dog-legged

The question was posed to me in examination.

My question is from Types of Stairs topic in chapter Arches, Lintels, Stairs and Formwork of Construction & Building Materials

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The correct choice is (c) Open Newel

Explanation: In Open Newel stair, the well maybe rectangular or of any geometrical shape and it can be used for fixing lifts. These stairs are useful where the available space for staircase has a width greater than twice the width of the steps.

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