Discussion
Which of the following statements regarding collapsible doors is INCORRECT?
Answer: B
It is incorrect that collapsible doors revolve about a pivoted point. Revolving doors rotate about a central pivot, but a collapsible door is made of steel strips or channels joined in a lattice so that it folds or collapses sideways, like a concertina, and slides in a track. The other three statements fit: the open lattice gives no privacy to a room, the gaps let air-conditioned air escape so they are not suitable for air-conditioned halls, and they are used as an entry and exit gate for shops and garages.
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