The Helios F 630 HQ adapter is designed to connect square ventilation shutters from the VK, RVK, EVK, and RAG series directly to round ducts or fan connectors from the HQ/HW series. It features four corner holes that align with the shutter’s mounting points for secure attachment. The round connector mounts onto the fan casing and is fixed in place using self-tapping screws, providing a reliable transition from square to round ventilation components.