Where is an air cleaning device typically installed within an HVAC system?

The correct placement of an air cleaning device within an HVAC system is generally before the air handler and evaporator. This positioning is crucial because it allows the air cleaning device to filter out dust, allergens, and other particles from the air before it passes through the system.

When the air is cleaned before it reaches the air handler, it not only improves indoor air quality but also protects the evaporator's coils by preventing dirt and debris from accumulating. This can enhance the efficiency of the system and prolong the life of its components. Maintaining clean coils is vital for optimal heat exchange and overall performance, as dirty coils can lead to inefficient operation and increased energy consumption.

The other contexts for installation are less effective for various reasons. For example, placing an air cleaning device inside the ductwork or at the exhaust outlet would not be as effective in filtering the incoming air that the system processes. Additionally, if an air cleaner was installed after the evaporator, contaminants could already settle on the coils and associated components, thereby negating the benefits of the air cleaner.