GATE 2023 AR — Architecture – Question 24
Which method prevents smoke from entering an enclosed fire-escape staircase?
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Correct answer: (B) Pressurization
Explanation
Pressurising the protected stair above the adjacent smoke-affected spaces creates outward airflow at leakage paths and opened doors. This resists smoke ingress and preserves the escape route. Polarization and fumigation do not provide that smoke-control mechanism. Thus B.