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Answer: replace conventional ducts with insulated ones or create a slight slope in the conduits.
When water is found in the ducts of a CMV, it comes from the natural condensation that forms, after the hot air extracted in humid rooms meets a colder air mass in the duct. Little by little, several liters of water can accumulate if we are not careful. To avoid this problem, it is recommended either to replace conventional ducts with insulated ones (more expensive of course), or to create a slight slope in the conduits so that the water can flow to a connection point with the waste water evacuation pipe, when the installation includes one (otherwise it is necessary to add one). In both cases, it will not be given. This is why it is better to think about it when installing the CMV. You too, send us your brico question