The Helios F 710 HQ adapter facilitates the attachment of square shutters from the VK, RVK, EVK, and RAG series to round ducts or fan connectors belonging to the HQ/HW series. It features four corner holes aligned with the shutter mounting points for secure installation. The round connector fits onto the fan casing and is fastened using self-tapping screws, offering a practical and sturdy solution for adapting square ventilation shutters to round ductwork.