Where are electronic air cleaners installed?

Where are electronic air cleaners installed?

• A. On the return air side
• B. On the supply air side
• C. In the ductwork
• D. On the furnace cabinet

Answer: (D)

Electronic air cleaners are installed in the furnace cabinet because they need to be part of the central air handler so every unit of air drawn by the blower passes across the cleaning elements. Mounting them in the cabinet places the high‑voltage components and cleaning cells with the furnace, uses the existing electrical and control wiring, and keeps maintenance convenient since you service it along with the furnace. This position ensures that all conditioned air flowing through the system is cleaned, not just air that happens to pass a separate duct section. Placing the cleaner elsewhere in the ductwork or on a different side of the system can limit the portion of air that's treated and complicate wiring and access for maintenance.

Electronic air cleaners are installed in the furnace cabinet because they need to be part of the central air handler so every unit of air drawn by the blower passes across the cleaning elements. Mounting them in the cabinet places the high‑voltage components and cleaning cells with the furnace, uses the existing electrical and control wiring, and keeps maintenance convenient since you service it along with the furnace. This position ensures that all conditioned air flowing through the system is cleaned, not just air that happens to pass a separate duct section. Placing the cleaner elsewhere in the ductwork or on a different side of the system can limit the portion of air that's treated and complicate wiring and access for maintenance.