https://www.ny-engineers.com/blog/how-hvac-engineers-use-energy-recovery-ventilation

Energy recovery ventilation (ERV) is one of the most useful energy efficiency measures in HVAC engineering. The purpose of ERV is recovering some of the energy contained in the airstream that leaves an indoor area. e ERV systems reduce the use of external energy inputs, they have a fundamental role in passive house design.
 

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