The sealing of ventilation networks is defined by a tightness class: A, B, C and D (the most airtight class).
Certified ducts and accessories constituting the ventilation network have an interlocking with integrated seal. They come in different shapes (circular or rectangular) and different materials (galvanized steel, aluminium, stainless steel or synthetic material).
As the tightness of certified ducts is achieved by a seal, it is not necessary to use sealant or adhesive tape. Installation is therefore easier compared to a network with standard accessories.
It is very easy to make the right choice: just compare the products. But when product performance is not certified, this becomes impossible.
Certification makes it possible to compare objectively.
Ventilation & indoor air quality for homes