13. "What is HRV technology?"

HRV stands for Heat Recovery Ventilator. It is a technology that has been used for the last 40 years worldwide to provide high quality indoor air into buildings for the benefits of the occupants. HRV technology is used for commercial and industrial buildings as well as residential buildings.

A genuine HRV system will provide the following:

  • fresh air into a building,
  • extract stale air from the building,
  • filter the fresh air entering the building to remove pollutants,
  • recover heat from the stale air using a heat exchange core,
  • and transfer the recovered heat to the incoming fresh air.

HRV systems are fully ducted systems delivering fresh filtered air from outside the building (external to the building and associated roof space) to living and bedrooms and extracting stale air from high moisture areas such as bathrooms, kitchens and laundries. Typically, an HRV is able to recover 70 to 90 percent of the heat from the exhaust air depending on the type of exchanger and transfer it, via the heat exchanger to the incoming air.

Schematic diagram of an HRV system
* Produced by Natural Resources Canada's - Office of Energy Efficiency - EnerGuide

This type of ventilation is referred to as balanced mechanical ventilation. see definition

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