Uses powered fans and equipment to provide a consistent airflow. This includes: Supply Systems: Use fans to push fresh air into a building.

Relies on passive forces like wind and temperature differences to move fresh air through windows, doors, and vents.

Ventilation is generally categorized by how air is moved and controlled:

In structures, ventilation is critical for moisture control, air quality, and temperature regulation.

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Combine supply and exhaust fans to maintain even pressure.