A manual duct lifter is a tool used in HVAC (heating, ventilation, and air conditioning) installations. It helps lift and position ductwork into place, making it easier for technicians to install ducts securely and efficiently. This tool is particularly useful in tight spaces where maneuvering large sections of duct can be challenging. By using a manual duct lifter, workers can save time and reduce the risk of injury while ensuring that the ductwork is properly aligned and supported.