HE3D K280 PASSIVE FAN DUCT

To resume I wanted to give a filament fan duct to my HE3D K280 but I did not have a 24V fan (one of 12V experimented here was burn out). So I have meditate and draw that passive fan duct. I use the air flow coming from the head fan radiator on both side and redirect it beside thru a mouth.
It looks like a case on the radiator that can be adjust fine with some refinement cuts inside. Very lightweight it will hold on the radiator No screw ! Flow is well adjusted below the nozzle. Obviously it is