Air duct – Definition & Meaning

Air ducts are an essential part of any heating, ventilation, and air conditioning (HVAC) system. These ducts are responsible for delivering and distributing air throughout a building, ensuring that the indoor environment remains comfortable and healthy. In this article, we will explore the definition and meaning of air ducts, their origins, and their associations.


An air duct is a pipe or channel that carries air from one place to another. It is typically made of metal, fiberglass, or plastic and is used in HVAC systems to distribute air throughout a building. Air ducts can be found in homes, offices, factories, and other types of buildings.


The origin of air ducts can be traced back to ancient Rome, where the first known heating and ventilation system was built. The system, called a hypocaust, used a series of underground ducts to heat buildings. In the 19th century, the first modern air conditioning system was developed, which used air ducts to distribute cool air throughout a building.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, an air duct is “a duct or pipe for conveying air (as from a heating or cooling system) to a room or building.” The Oxford English Dictionary defines it as “a pipe or conduit for conveying air, especially in a heating or ventilation system.”


Air ducts are often associated with HVAC systems, which are used to regulate the temperature and air quality in a building. They are also associated with indoor air pollution, as dirty air ducts can lead to the buildup of dust, allergens, and other pollutants.


Some synonyms for air duct include:

  • Ventilation duct.
  • Air channel.
  • Airway.
  • Conduit.
  • Pipe.


There are no direct antonyms for air duct, as it is a specific term that refers to a type of pipe or channel used for conveying air.

The same root words

The root words of air duct are “air” and “duct.” Air refers to the invisible gas that surrounds us and is essential for life. Duct refers to a tube or channel that is used for conveying liquid or gas.

Example Sentences

  • The air ducts in our office building need to be cleaned.
  • The HVAC technician inspected the air ducts for leaks.
  • The air ducts in the warehouse were too small for the amount of air that needed to be circulated.
  • The new apartment complex has state-of-the-art air ducts that provide excellent air quality.
  • The old building had asbestos in the air ducts, which had to be removed before the building could be occupied.
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