Comprehensive and Detailed Explanation From Exact Extract:
With openings allowing wind passage, pressure on the interior of wall A varies:
Wind pressure on the windward side induces positive pressure toward wall A.
Wind entering openings can create localized negative pressure (suction) on the interior surface, acting away from wall A.
Thus, the interior face experiences both positive and negative pressures depending on location and airflow, meaning D. Acting both toward and away from wall A is correct.
[References:, , ARE 5.0 PPD – Environmental Conditions and Context, Wind Loads on Building Enclosures, , The Architect’s Handbook of Professional Practice, 15th Edition – Building Envelope Design]
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