Which of the following is NOT a duct connection to an HRV?

In heat recovery ventilation (HRV) systems, the duct connections play specific roles in managing air flow. The purpose of an HRV is to exchange stale indoor air with fresh outdoor air while minimizing energy loss.

The connections include an exhaust air outlet, which removes stale air from the indoor environment, and a fresh air inlet, which brings in fresh outdoor air. The stale exhaust air inlet is part of the process as it allows the HRV unit to intake stale air for heat recovery before it's expelled outside.

The return air duct, however, does not typically connect directly to an HRV system. This duct is designed to return air from a conditioned space back to the heating or cooling system. While it plays a crucial role in the overall HVAC arrangement, it does not function as a direct duct connection to an HRV. Therefore, it is accurate to identify the return air duct as not being a duct connection to an HRV. Understanding the distinctions between these connections helps clarify the specific function each duct serves in the ventilation and air exchange process.