Square ducts are air ducts used in ventilation, heating and air conditioning systems in residential, commercial and industrial buildings. Unlike round ducts (circular or spiroducts), square ducts have a square or rectangular shape, allowing them to fit into tighter or more angular spaces.

Square ducts are typically fabricated from sheets of metal, such as galvanized steel, stainless steel, or aluminum, that are bent and joined into square or rectangular shapes. They can also be made of other materials, such as fiberglass, plastic, or flexible metal.

One of the main benefits of square ducts is their ability to transport large volumes of air. This makes them ideal for commercial and industrial buildings where a large amount of air conditioning or heating is needed.

Also, square ducts are easier to install in tight spaces or with sharp corners, which can be a challenge for round ducts.

Another advantage of square ducts is that their flat shape makes them easier to insulate and seal, helping to reduce energy losses. Specific fan boxes and diffusers can also be used to fit square ducts, allowing them to provide a larger amount of air conditioning or heating more efficiently.

In summary, square ducts are a practical alternative to circular or spiroducts in ventilation, heating and air conditioning systems. Their flat shape and ability to carry large volumes of air make them ideal for commercial and industrial buildings. Additionally, their ability to fit into tighter or angular spaces and their ease of installation and sealing make them a popular choice for residential buildings as well.


Rectangular ducts have been around for a longer time than Spiral ducts. This has made this type of duct much more popular and widely recognizable.

One of the advantages of rectangular duct is its capability of moving high volumes of air in low height areas, they are also more commonly used in exterior Ventilation products were the visual aspect is less important.  Usually made of galvanized metal, can be sectioned for easier transportation and installation purposes.

16 to 26 Gauge

Straight Ducts, Parts and Accessories


4 to 80 in Dimension Combinations

Download Technical Sheets

More differences exist between round and rectangular air ducts than you might think. Choosing one type over the other can make or break the effectiveness of your HVAC system.

Air pressure

Air pressure is a very important factor to consider when selecting the right type of duct for your project.  If you are working with low air pressure systems, rectangular ducts are more efficient and provide more stable flow conditions. Work pressure will determine the type of reinforcement and gauge of the sheet you will need.

Building dimensions

Another important element to take into consideration when in the process of selecting the type of duct you will be working with is the Dimensional space available for the ductwork. Round ducts can be nicer to the eye however they are larger and need more space to be able to install. If limited space is one of your concerns, then rectangular ducts may be your better choice.

Installation cost

Installation is a very important factor in your project.  And yes, most of the time installing Round Ducts is much less expensive.  However, for certain types of jobs and when it comes to special types of HVAC Equipment, the additional cost in rectangular ducts pays off versus the benefits obtained in higher efficiency

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