There are three types of ducting which will help you in ventilating your property. The three types of ducting that are used for domestic ventilation systems they are

  • Rigid Ducting
  • Semi Rigid ducting
  •  Flexible ducting

These three types of ventilation ducting systems will be explained in this article. You will get the knowledge of the best installation practices, the best time to use each type and also the effect each type has on the ventilation system pressure.

What is flexible ducting?

Flexible ducting can be available in the materials such as PVC, PVC coated aluminum, aluminum and insulated aluminum. It is best used when you cannot install the rigid ducting because of less space or because of an awkward installation.

The length should not exceed 1.5 meters for the axial fans, about 6 meters for centrifugal fans and 3 meters. The most number of bends should be 2 and it depends on the rate of flow.

A flexible system has to be pulled thought to make sure that the entire internal diameter should be obtained and the resistance is reduced. The length of the duct should not exceed 90 % of its total length.

As the duct passes through the areas that are not heated like the loft spaces, there should be insulation to the ducting with at least 25mm of the material and the thermal conductivity should be equal to or less than0-04W (m.k) to reduce the condensation developed.

The PVC ducting is the most inexpensive one in the market and is a lot versatile. It can be majorly used in general ventilation connection application like the cooker hoods.

What is rigid ducting?

Rigid ducting can be done in both plastic and also on expanded Polypropylene (EPP) and can be utilized as a larger ducting system or as a single component. Rigid ducting can be used as and when there is a possibility in the ventilation system, so that the duct resistance and bends in the system is reduced.

Usually, the rigid plastic ducting is most suited for a lot of installations. But EPP rigid ducting should be installed in places where the unit is outside or is passing through the areas that are not heated like the loft spaces. This type of the rigid ducting provides a protection that is anti-static. And also, is the flame radiant to EU 82 – DIN 4102 standards in the case of high-quality products.

What is semi-rigid ducting?

Semi-rigid ducting is considered as the best type of ventilation ducting in the business. It provides installers and when using the semi rigid ducting in their ventilation system for a lot of advantages.
A better quality semi rigid ducting provides an optimal performance in a ventilation system to operate. This is because it is a zero leakage ventilation system. It also reduces the time of installation to about 70% and provides SAP appendix Q points as well. The high quality semi rigid ducting system can withstand force up to 13 kN/m2 and has high crushability levels as well.

Some of the semi-rigid ducting systems provide installer versatility as it allows it to switch from oval to round and vise versa. In doing so the system performance and the hydraulic pressure loss is intact.
It is a lot easy to maintain the ventilation system as the semi rigid ducting systems provide anti bacterial and anti static lining. Also, they are very easy to clean after installation.
Ideally the semi rigid ducting is applied when you use a home ventilation system like the MVHR unit.

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