How do you find a fresh air duct on heat pump?

To find a fresh air duct on a heat pump, first locate the outdoor unit and follow the ductwork leading from it to the indoor unit. Look for any dedicated duct or vent labeled as "fresh air" or "makeup air," often installed to bring in outside air. Additionally, check the system's manual for diagrams or specifications indicating the fresh air intake. If you're unsure, consulting a professional HVAC technician can provide clarity and ensure proper identification.