52NOTEOnly the supply air fan isequipped with a sound-dampinggrid.MAINTENANCERemoving and cleaning the supply and extractair fansTo clean the supply air fan:1. Disconnect the ventilation unit from the mains electricity supply.2. Open the doors of the unit.3. Pull the temperature sensor out of the rubber feed through (A).4. Disconnect the quick connector (B) of the fan cables.5. Remove the rubber feed through (C).6. Undo the fan’s mounting screws.7. Pull the fan out of its housing.8. Clean the fan.9. To reassemble the ventilation unit, follow the above steps inreverse order.10. Close the doors. Ensure that the safety switch catch of the dooris touching the safety switch.11. Plug the ventilation unit back into the mains.The fan has now been checked and cleaned.Clean the extract air fan in the same way. The extract air fan islocated symmetrically on the opposite side of the unit.CLEANING THE FANS (INSTALLER)Check the cleanliness of the fans when servicing the filters and the heat recovery cell. Clean the fans asrequired.You can clean the fan blades with compressed air (wear protective goggles) or by brushing them gently.IMPORTANTThe fans are extremelysensitive to external shocks. Itis recommended that the fansbe cleaned in place, i.e. withoutattempting to remove them.Handle the fan blades carefully.Do not remove or move the fanblade balancing weights.NOTERemember to replace thetemperature sensor by feedingit through the rubber feed.ABC