Which of the following is NOT a component of HRV systems?

In heat recovery ventilation (HRV) systems, the primary components include heat exchangers, duct systems, and fans.

Heat exchangers play a crucial role by transferring heat between the incoming and outgoing airstreams without mixing them, helping to conserve energy while maintaining indoor air quality. Duct systems are essential for distributing the conditioned air throughout the building, ensuring proper circulation and ventilation. Fans are necessary to move air through the system, facilitating the exchange between the indoor and outdoor environments.

Condensing units are typically associated with air conditioning systems and refrigeration. They are not a component of HRV systems, as their primary function is to extract heat from refrigerant, which is not part of the heat recovery process in ventilation systems. Therefore, identifying condensing units as not being a part of HRV systems highlights their specific function versus the dedicated components of an HRV system.