Cleaning the heat recovery cell

Warning: The safety switch automatically turns off the power when the upper door of the Vallox ventilation unit is opened. Always disconnect the Vallox ventilation unit from the mains before starting maintenance.

Check that the heat recovery cell is clean roughly once a year, or whenever the filters are being replaced. Clean by washing as required.

To check and clean the heat recovery cells:

  1. Disconnect the ventilation unit from the mains electricity supply.
  2. Open the door of the Vallox ventilation unit by undoing the finger screws.
  3. Lift the door off.
    CAUTION: The door is heavy.
  4. Remove the supply air filter (A).


  5. Turn the upper support of the cell (B) to the upper position (anti-clockwise).
  6. Remove the extract air filter (C).
  7. Lift and pull the HR cell (D) out of the unit.
  8. If the cell is dirty, clean it by immersing it in warm water, to which a small amount of a mild detergent has been added.
  9. Rinse the cell clean with a water spray. Do not use a high-pressure cleaner.
  10. When all the water has drained from between the layers, reassemble the ventilation unit as follows:
  11. Ensure that the lower support (E) is in place against the knobs at the bottom of the unit.


  12. Lift the HR cell in place.
  13. Turn the upper support against the cell. Ensure that the upper support is properly nestled against the cell (remains upright).
  14. Install the extract air filter (C) and the supply air filters (A) in place.
  15. Close the door of the unit. Ensure that the safety switch catch of the door is touching the safety switch, allowing the unit to be turned on.Achten Sie darauf, dass der Verschlusshebel des Sicherheitsschalters für die Tür den Sicherheitsschalter berührt, so dass das Lüftungsgerät eingeschaltet werden kann.
  16. Plug the ventilation unit back into the mains.