A positive pressure fan is effective against winds of ____?

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Multiple Choice

A positive pressure fan is effective against winds of ____?

Explanation:
Positive pressure ventilation works by forcing air into a structure to create a higher internal pressure than outside, pushing smoke and heat out through openings. Wind outside adds opposing pressure, so as wind speed increases it counteracts the internal pressurization and reduces effectiveness. In typical training guidelines, PPV remains effective up to about 25 mph when the fan is properly placed and openings are managed. Winds around or below this limit allow the fan to establish the necessary pressure differential, while much stronger winds (and certainly around 40 mph) make PPV unreliable or unsafe. So, the practical answer is that a positive pressure fan is effective against winds of 25 mph.

Positive pressure ventilation works by forcing air into a structure to create a higher internal pressure than outside, pushing smoke and heat out through openings. Wind outside adds opposing pressure, so as wind speed increases it counteracts the internal pressurization and reduces effectiveness. In typical training guidelines, PPV remains effective up to about 25 mph when the fan is properly placed and openings are managed. Winds around or below this limit allow the fan to establish the necessary pressure differential, while much stronger winds (and certainly around 40 mph) make PPV unreliable or unsafe. So, the practical answer is that a positive pressure fan is effective against winds of 25 mph.

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