Making adjustments to the mounting sleeve

• Saw the mounting sleeve to size using a band saw or manually. Always make the cut at an angle and parallel to the cutting marks.
• Do not use hot wire cutters.
• Drilling: The mounting sleeve may only be drilled through in the area of the line feedthrough and with a maximum wall thickness. Otherwise, drilling is not permitted.
  ATTENTION: Building damage due to leakage/condensation (heat exchanger). Ingress of dirt with a drilled mounting sleeve can damage the fans. Additionally seal the line feedthrough.
  ATTENTION: If holes are drilled in an unauthorised location, the connection cable cannot be inserted correctly. Then, final installation is not possible.
• Do not damage the mounting sleeve during installation or modify it in unauthorised places, e.g. drilling or screwing. Damaged mounting sleeves can lead to incorrect air in the ventilation channel, malfunctions in the ventilation, water ingress into the mounting sleeve and even water ingress into the masonry.