Positive pressure ventilation is effective:

A. when opening of doors and windows in the structure can be controlled.
B. only if you can create a lower pressure zone in the structure.
C. if the exhaust opening is smaller than the entry point, creating a Venturi effect.
D. if an entire floor is ventilated at a time, starting at the highest floor and working down.


Answer: A. when opening of doors and windows in the structure can be controlled.

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