"In-ducts" refers to the process or system of installing or repairing components within a duct or ventilation system. It involves accessing and working on the inner parts of the ductwork, which may include tasks such as cleaning, sealing, insulating, or installing equipment like filters or dampers. The 📥🔧 symbol represents the concept of materials being received (📥) and tools being used (🔧) in the context of in-duct work.