Heat recovery ventilation units (HRVs) are ventilation systems designed to recover the total heat of indoor air, thus conserving energy. They find extensive use in both residential and commercial buildings. The unit features easily removable filters and heat exchangers for convenient cleaning. An internal air filter ensures that the fresh air circulated into the room remains pure and free from dust. Constructed with antibacterial and anti-mildew materials, the heat exchange core ensures the delivery of healthy air. The unique by-pass mode reduces the power consumption of the fan motor, thereby extending the lifetime of the heat exchanger core.