The Lindab Blog

Keeping it tight – the importance of air tight ducts in ventilation systems

By Torbjörn Bruzelius, September 25 2015


The indoor climate effects your health and your productivity as we have covered in another blog post. But did you know that it also effects your economy? How is that, you might wonder. There are a number of ways that it effects your economy such as installation costs, but in this post we will focus on something that we at Lindab put a lot of effort into – air tightness.

How does air tight ducts save you money?

If the ventilation system is not air tight, the leakage must be compensated with an increased fan flow. This requires an over dimensioning of the unit’s parts such as fans, filters, coil batteries for heating and cooling, heat exchangers and so on. All of this causes an increased energy consumption and hence increased costs and a greater impact on the environment than necessary. It is also not entirely uncommon for the leaking air to cause a disturbing hissing sound.

You might think that it’s just air, it can’t be that expensive. But if you use our web tool Calc Leak you can see that if you for example move from class 2,5  A to class C in a 1000 m2 office you will save about 500 € annually on your energy bill. And if you look at the bigger picture – according to the report Energy saving potential in Europe, Duct leakage in European buildings: status and perspectives, Energy and Buildings 32, Europe could save 10 TWh annually by moving from air tightness class A to class C. That is comparable to three nuclear reactors! So don’t let your money literally vanish into thin air.

The best ventilation system for air tightness

We had TÜV (Technischer Überwachungsverein) Rheinland test five different ventilation systems for air tightness - but also for investment cost and installation time. You can download the report by clicking the button below.

Download the TÜV report now!

Topics: Sustainability, Indoor Climate

Torbjörn Bruzelius

Torbjörn is the Product Manager for Ventilation Products. His knowledge in ventilation runs really deep after being at Lindab for more than 30 years.
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The Lindab blog aims to give you an inside track to our company. We would like to share our knowledge from over 50 years of production for the construction and ventilation businesses.