What is an Air Duct? Effects, Composition and Classification of Round – Square Air Ducts

1. What is an air duct?

Air ducts are an important device in the ventilation and air conditioning (HVAC) system, helping to circulate and distribute air in buildings, factories, commercial centers, hospitals, and many other projects. As a connection between equipment such as ventilation fans, air conditioners, and functional rooms, air ducts ensure that the interior space is always cool, clean, and meets air quality standards.

2. Effect of air duct

• Providing and coordinating fresh air: Helps bring air from outside to inside, ensuring oxygen for users.
• Eliminate exhaust gases and toxic gases: Especially in factories, clean rooms or closed areas.
• Keep the space cool and fresh: Supports the process of regulating temperature and humidity in the building.
• Ensure safety and health standards: A good ventilation system helps reduce the risk of indoor air pollution.

3. Structural components of the air duct system

A complete duct system usually includes:

• Main air duct: Can be round or square air duct, leading air from the center to used areas.
• Branch air ducts: Connect to specific locations in the building.
• Connecting, constricting, numbing elbow: Used to redirect or branch the air flow.
• Air valve (stop valve, adjustment valve): Regulates air volume according to usage needs.
• Air mouth (suction mouth and blowing mouth): Communication between the duct system and the used environment.
• Sound and heat insulation accessories: Reduce noise and limit heat loss.

4. Air duct classification: Round and Square

Round air duct

• Advantage:

  • Optimized air conductivity, less pressure loss.
  • Creates little noise due to steady air flow.
  • Easy to install for ceiling-mounted systems and long paths.

• Disadvantages:

  • Difficult to construct in narrow spaces or corners.
  • Difficult to connect to square/rectangular devices.

Square (rectangular) air duct

• Advantage:

  • Suitable for narrow spaces or close to the ceiling.
  • Easy to install into square technical boxes, walls, floors.

• Disadvantages:

  • Easier to cause pressure loss than round pipes.
  • Noise may arise if not well soundproofed.

Choosing the type of air duct depends on:

• Intended use
• Installation space
• Technical requirements on flow, pressure, noise level

5. High quality air duct products from Eusteel

Eusteel is a unit specializing in providing round and square air ducts with quality that meets ISO standards. The product is precision machined, high quality galvanized materials, ensuring durability, corrosion resistance and optimal air conductivity. With modern production processes and a highly specialized technical team, Eusteel is a reliable choice for any project requiring a high-quality ventilation system.