In Fig. 11 & 12 you can see the detail of the arc structure in the bottom
part of the hushbox.
In Fig. 13 & 14 you can see the chassis on which the 120 mm fans will be
installed. These chassis have been built from scrap sheets of steel. They have
been cut and bent in order to provide a conical air inlet/outlet for the fans.
This designs provides a slower inlet/outlet air speed, therefore decreasing