Lesson 3.5.3
Combination systems
Dry outdoor air can be used to flush the property and help remove indoor humidity. Ventilation fans can draw this dry air in through slightly opened windows or other controlled openings.
Condition-dependent
Only effective when outdoor conditions are favourable, specifically when the outdoor humidity ratio is lower than indoors.
Flexible strategy
Technicians can switch between open and closed system techniques depending on real-time environmental conditions.