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Do you know the mechanical fans by depression (vacuum cleaners in the walls)? I have a problem of capillary rise and I am interested by this process?

Mechanical vacuum ventilation systems seem to be satisfactory. It is inspired by terracotta drains often placed on the outskirts of wet walls. The system has two limitations:
- it does not address the cause of the problem.
- like any mechanical system, it is exposed to breakdowns and consumes electricity (there are however systems powered by small photovoltaic panels).
When it's technically possible, it makes more sense to deal with the problem at the source, Peripheral drainage and an waterproof barrier, as low as possible in the walls, which will definitively block hair lifts. A watertight barrier can also be obtained by injection of resins into holes drilled at regular intervals in the wall.

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