What is the main problem with flex duct?

Flexible ducts not only resist airflow, but are also more susceptible to poor installation. Many factors can fail, such as a poorly sealed joint, excessive unsupported length, and wrinkled sections. In addition, the material itself is less durable than sheet metal. Sheet metal ducts tend to be square, so it's fairly easy to seal them where one part begins and another ends.

However, flexible ducts are cylindrical and flexible. Although they are ideal for fitting in tight spaces or with an odd design, sealing them can be difficult. As a result, incomplete or incorrect duct seals cause leaks. The friction in a standard duct is fairly constant. However, friction varies in flexible ducts.

The speed of friction in flexible ducts has a lot to do with the design of the ducts. Therefore, you can usually see sources of inefficiency due to friction with the naked eye. Friction in a flexible duct system will depend on the extension of the duct, the duct support system and the curves of the duct network. However, as with any great product, the key to optimal performance is proper installation.

All too often, flexible ducts are not installed properly and end up folded, bundled, undersized or flabby.

Ava Wolma
Ava Wolma

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