Which ventilation method uses fans to push air into a structure?

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Multiple Choice

Which ventilation method uses fans to push air into a structure?

Explanation:
Positive pressure ventilation (PPV) pushes fresh air into the building with a fan, creating a higher pressure inside than outside. That added pressure drives smoke, heat, and gases out through available openings, making conditions safer for occupants and firefighters and improving visibility. This differs from natural ventilation, which relies on wind and temperature differences without mechanical help, and from negative pressure or exhaust ventilation, which remove air to create a negative pressure inside and pull outside air in through openings rather than pushing air in.

Positive pressure ventilation (PPV) pushes fresh air into the building with a fan, creating a higher pressure inside than outside. That added pressure drives smoke, heat, and gases out through available openings, making conditions safer for occupants and firefighters and improving visibility. This differs from natural ventilation, which relies on wind and temperature differences without mechanical help, and from negative pressure or exhaust ventilation, which remove air to create a negative pressure inside and pull outside air in through openings rather than pushing air in.

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