100% developed in Germany TÜV-certified sound level specifications = real data received the international if-Award 2013 extremely low-noise bionic loop rotor bionic deep sound fan frame position-invariant magnetic ball bearing NB-NanoSLI silent NB-EKA P2 Drive Bayer Makrolon rotor with anti-dust technology weighted reinforced fibreglass PBT frame NB cable management with two pluggable connection cables