40MAINTENANCERemoving and cleaning the supply air fan (A)To clean the supply air fan:1. Disconnect the ventilation unit from the mains electricitysupply.2. Lift the latch to open the door of the Vallox ventilation unit.3. Lift the door off.CAUTIONThe door is heavy.4. Remove the fine filter (1). To do so, pull the fine filter out ofthe unit.5. The fan has been fastened on the mounting plate withwing bolts (2). Remove the wing bolts and lift the fan out ofthe unit.6. Disconnect the quick connector (3) of the fan cable.7. Clean the fan. The fan blades can be cleaned withcompressed air (wear protective goggles) or by brushingthem gently. Do not remove or move the fan bladebalancing weights.8. To reassemble the ventilation unit, follow the above stepsin reverse order.9. Close the door. Ensure that the safety switch catch of thedoor is touching the safety switch.10. Plug the ventilation unit back into the mains.Removing and cleaning the extract air fan (B)To clean the extract air fan:1. Disconnect the ventilation unit from the mains electricitysupply.2. Lift the latch to open the door of the ventilation unit.3. Lift the door off.CAUTIONThe door is heavy.4. The fan has been fastened on the mounting plate withwing bolts. Remove the wing bolts and lower the fan out ofthe unit.5. Disconnect the quick connector of the fan cable.6. Clean the fan. The fan blades can be cleaned withcompressed air (wear protective goggles) or by brushingthem gently. Do not remove or move the fan bladebalancing weights.7. To reassemble the ventilation unit, follow the above stepsin reverse order.8. Close the door. Ensure that the safety switch catch of thedoor is touching the safety switch.9. Plug the ventilation unit back into the mains.CLEANING THE FANS (INSTALLER)Check the cleanliness of the fans when servicing the filters and the heatrecovery cell. Clean the fans as required.BA221BA32 xIMPORTANTThe 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.