The Helios F 710 DK adapter is designed to connect square shutters from the VK, RVK, EVK, and RAG series directly to round ducts or fan connectors of the HQ/HW series. It includes four corner holes that align with the shutter attachment points, ensuring a secure and stable installation. The round connector fits onto the fan casing and is fastened with self-tapping screws, providing a reliable solution for adapting square ventilation components to round duct systems.