This outdoor unit best balances extreme low noise with the highest possible efficiency while still retaining super compact dimensions. The excellent aerodynamics of the front grille with wide lamellas reduces turbulence and ensures silent operation and low energy consumption. The unobtrusive design fits various architectures and the silver color assimilates with most environments. The dark front grill makes the fan invisible allowing a non-technical appearance. All components are made to last for a very long lifetime. Usage of steel, copper and aluminum and non-painted plastics allow the product to be easily disassembled for effective recycling.