A duct is a tube or channel that carries air, gas, or sometimes other materials from one place to another. In everyday English, people usually mean an air passage used in buildings, like the metal or flexible pipes in heating and cooling systems.
You’ll often hear “duct” when talking about air conditioning, heating, or ventilation. For example, ducts move warm or cool air through a house or office, helping keep the space comfortable. The word can also be used in other settings, but in daily life it most often refers to airflow systems.
Meaning & Usage
A duct is a passage that transports something, usually air. In homes and buildings, ducts are part of HVAC systems and help spread air to different rooms.
Examples
The house has ducts in the ceiling that carry cool air to every room.
The workers cleaned the air ducts because they were full of dust.
Context / Common Use
Most people use “duct” when talking about heating, cooling, or ventilation. You may also hear phrases like “air duct” or “duct system.”
What is a duct used for?
A duct is used to move air or gas from one place to another, especially in buildings.
What is an air duct?
An air duct is a duct that carries heated, cooled, or fresh air through a building.
Why are ducts important?
Ducts help keep indoor spaces comfortable by moving air where it is needed.
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