1.The fan is a 4-inch twin fan purchased from Rakuten, model HX-T205SE, 12V, 6.5W. The airflow can be adjusted continuously and the noise level is quiet at 50dB.

2.When attached to the roof frame of a tractor as is, the pitch of the two fans seems too narrow to blow air behind the head.

3.When I opened it up, the wiring was very simple.

4.It seems like it would be better to leave this circuit board and use it. I decided to cut this plastic cover in two and use it, so I drew a diagram.

5.The rotating part of the fan has an O-ring inside, so it can be stopped at any position.

6.First, divide this plastic cover into two parts.

7.I replaced the tip of my homemade small table saw with one for cutting plastic.

8.Cut using a miter gauge.

9.By using a tip specifically designed for plastic, you can cut without burrs like this.

10.The top and bottom covers are divided into two parts.

11.We decided to use ash wood for the extension board.

12.Cut one side at a right angle using a hand-operated electric planer.

13.Cut to 35mm width using a table saw.

14.Use a trimmer to cut out the 2mm step that will be inserted into the plastic cover on the end surface.

15.6mm wide groove for passing electrical cables through.

16.A wooden part with grooves.

17.3.5mm holes for fixing to the tractor roof frame.

18.Countersunk hole for flat head screws.

19.The screws used to attach the fan to the car seat headrest were cut off as they were not needed.

20.Drill holes in the short plastic cover so that it can be attached to the wooden part.

21.Drill holes in the longer plastic cover in the same way.

22.Countersinking.

23.There is a protrusion inside, so I cut that part out with a micro router.

24.The wooden parts are painted matte black and plastic covers are attached to both ends.

25.To increase the strength of the fan's mounting, we created aluminum plates to attach to the plastic covers on both ends. We cut 15mm wide aluminum plates to lengths of 29mm.

26.The two finished aluminum plates were then drilled and painted matte black.

27.Drill a 2.5mm pilot hole for an M3 tap in the longer plastic cover.

28.Drill holes in the shorter plastic cover as well.

29.M3 tap.

30.The spacers between the aluminum plate and the tractor roof frame were made of rosewood, which was cut to the required length using a table saw.

31.The finished spacer, which was also painted matte black.

32.Wired using a two-core cable.

33.I used the board as is and soldered it on.

34.To attach it to the aluminum plate, attach double-sided tape to the spacer.

35.The aluminum plate with the spacers attached is fixed to the plastic cover with M3 cap screws and nuts.

36.Attach the aluminum plates to both plastic covers and you're done.

I think it turned out pretty well.

Now the next step is to attach it to the tractor.

It's getting hot, so we've finished installing it before rice planting!!

The wiring was secured with staples.

The switch was mounted below the drink holder. A 2mm thick aluminum plate was attached to the back of the switch using strong double-sided tape.