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Answer: the flexible conduit is more affordable, the rigid plastic conduit is less manageable but more resistant.
There are two main categories of ventilation ducts on the market. The first is the flexible duct made of galvanized steel or aluminum reinforced with a wire. It is very handy and very affordable, which is why it is the most used in housing in France, but less resistant than the other type (crushing or tearing possible). The second model is the rigid plastic ventilation duct, by far the most resistant (it does not collapse) but this makes it less manageable in return. So, in summary, if you are looking for the best quality / price ratio, you should opt for the flexible steel or aluminum conduit. If, on the other hand, you prefer more reliable ventilation ducts in the long term, the rigid plastic duct prevails. You too, send us your brico question