In order to avoid air moving in the wrong direction when installing fans in ducts without natural ventilation (e.g. through an external wall), the Pax Passad backdraught shutter accessory can easily be retrofitted. A requirement for this is that another ventilation system must manage the basic ventilation flow of the building. Note: A backdraught shutter has a negative effect if the fan is installed in a ventilation duct with natural ventilation.
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