Where are air filtration devices generally located?

Air filtration devices are typically positioned in the return air plenum because this placement allows them to clean the air before it is heated or cooled and redistributed throughout the building. The return air plenum is responsible for collecting air from various spaces within a building and channeling it back to the heating or cooling unit. By filtering the air at this point, these devices effectively remove dust, pollen, and other contaminants, ensuring that cleaner air enters the system for conditioning.

Filtering the air in the return air plenum is crucial for maintaining indoor air quality and the efficiency of the HVAC system. When contaminants are removed before the air reaches the heating or cooling unit, it also helps in reducing wear and tear on equipment, contributing to a longer lifespan for the system. This strategic positioning also minimizes the risk of allergens and particulate matter being recirculated back into the indoor environment, promoting better health and comfort for occupants.