This is an internal Fan-Bracket for the Tevo-Flash 3D printer. It holds an "Noctua NF-A4x10 FLX 40mm" silent fan and also a "DC DC Buck Converter Step-Down Module" (22mm x 17mm x 2.2mm) There is a tiny potentiometer on the Buck Converter to adjust the **24 volt down to 12V** since the **fan is only 12 volt !!** Noctua Fan: http://www.c3d.at/g?i=nf-a4x10&p=6 Buck Converter: http://www.c3d.at/g?i=mp1584en&p=6 [Noctua NF-A4x10 FLX 40mm](http://www.c3d.at/g?i=nf-a4x10&p=6) [DC-DC Buck Converter](http://www.c3d.at/g?i=mp1584en&p=6) **Noctua NF-A4x10 FLX 40mm** **DC-DC Buck Converter**