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mm x 60 mm duct to fitting connector (GD817SSCI)
The adjustable overrun timer operates automatically when installed
An Engineer favourite
Manual boost inhibit
Therefore the unit supply of fresh replacement air is reduced and will become less effective - Service your unit and replace the filter
Zehnder Filter set Coarse 60% (G4) + ePM1 60% (F7) for ComfoAir 70 52291575 mm x 60 mm ductThis set consists of 2x filters Coarse 60% (G4). Coarse 60% is the name according to the new filter standard ISO 16890. Course refers to particles 10 micron. Coarse 60% means that at least 60% of particles in the size interval 10 micron are removed. G4 is the classification earlier used. Both filters can be used for supply and extraction air.
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