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In the renovation of old buildings, the traditional double flow ventilation system, that is to say centralized with a network of supply ducts and a network of extraction ducts, is generally not technically possible. The solution is the decentralized double flow ventilation system.
Its operation is almost identical to a classic double-flow system.
Ambient pollutants such as VOCs, odors, and humidity are expelled outside. In compensation, preheated fresh air is blown into the habitat. The two flows cross in the exchanger without mixing. The heat contained in the extracted air is transferred to the fresh outside air via the energy recuperator.
The efficiency is lower than a high-efficiency centralized double-flow ventilation system. It is around 70 to 80% compared to over 90% for the best decentralized double-flow systems.
This ventilation system ensures air quality in old buildings when the renovation has achieved significant airtightness. The filters used are the same as a centralized double flow ventilation system, type G4.
Today, products have integrated programming modules or even air quality sensors that allow continuous regulation of the fans based on air quality to ensure management adapted to local needs.
Filtration is an additional benefit provided by decentralized double flow ventilation with heat recovery. It improves air quality and indoor cleanliness. It also eliminates the disadvantages related to natural ventilation: insect entry, risk of intrusion, and fouling. Decentralized double flow ventilation systems are equipped with filters that are recommended to be changed at least once a year.
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