What is the role of return ducts in the HVAC system?

What is the role of return ducts in the HVAC system?

• A. Return ducts vent air to the outdoors
• B. Return ducts supply conditioned air to rooms
• C. Return ducts filter the air before it enters the air handler
• D. Return ducts allow air to return to the air handler for distribution to the supply system

Answer: (D)

Return ducts are part of the air’s return path: they carry air from the living spaces back to the air handler so it can be cooled or heated again and then pushed out through the supply ducts to the rooms. This completes the airflow loop and helps maintain proper pressure and continuous circulation. They don’t vent air outdoors—that’s exhaust. They also don’t directly supply conditioned air to rooms—that’s the supply duct’s job, and filtration happens at the air handler or return opening, not as the primary role of the return duct itself.

Return ducts are part of the air’s return path: they carry air from the living spaces back to the air handler so it can be cooled or heated again and then pushed out through the supply ducts to the rooms. This completes the airflow loop and helps maintain proper pressure and continuous circulation. They don’t vent air outdoors—that’s exhaust. They also don’t directly supply conditioned air to rooms—that’s the supply duct’s job, and filtration happens at the air handler or return opening, not as the primary role of the return duct itself.