How does the simplified duct configuration work in HRVs and ERVs?

The simplified duct configuration in Heat Recovery Ventilators (HRVs) and Energy Recovery Ventilators (ERVs) is designed to enhance ventilation efficiency by strategically managing airflow in a building. The correct answer highlights how these systems improve indoor air quality while ensuring energy efficiency.

In this specific configuration, the system draws polluted air from the HVAC return duct, effectively removing contaminants that accumulate within the indoor environment. By introducing outside ventilation air downstream from where the exhaust air duct connects, it ensures that the incoming fresh air is mixed effectively with the existing return air before it is reconditioned and distributed throughout the space. This method minimizes the risk of cross-contamination and ensures that fresh air is delivered at appropriate levels while still maintaining the system’s efficiency.

This approach is particularly advantageous as it allows for better control of airflow, resulting in improved energy recovery and better temperature regulation. It also helps maintain a consistent indoor climate, which is crucial for occupant comfort and health. The focus on utilizing existing HVAC infrastructure also simplifies installations and enhances the overall performance of the ventilation system without needing extensive additional ductwork.