Conventional recirculation systems are driven with a fixed area ratio setting between the fresh air and recirculating air.
This results in a significant portion of the fan capacity (up to
50%) being guided via the permanently open recirculation
gap even with summer ventilation. The ZLV Vario fresh air
distributor’s sliding fan module makes it possible to variably
adjust the recirculation gap. The advantage of this is that
100% of the fan capacity is available as fresh air capacity
during summer operation. This means that the number of
fresh air chimneys required can be halved through the use of
the ZLV Vario fresh air distributors.