What is an Air Duct?
Air duct definition - Pipes that provide ventilation to rooms. These pipes can carry warm and/or cold air to each room from the furnace or air conditioning system.
Ideal Home Garden Explains
Air ducts are generally found in the ceiling, and are used in most central air units. The benefits of having air ducts are that they equally divide the warm or cold air in a household or office. They also help cool or heat an area quicker, which saves energy.