• 1
    Step 1

    Cut the base plates (390mm x 130mm) (twic for front and back) using a circular saw or anything else which gives you good results

  • 2
    Step 2

    Mark the middle of the hole on both base plates according to the drawing. Important is to consider that the side walls will take some space away - so you have to measure them first and from there evenly distribute the mid points of each circle on the midline of the base plate. Draw the circles (55mm radius for my Emermax fans) around the makred mid points using a compasses.

  • 3
    Step 3

    Swa out the inner circles using a jigsaw. Drill a hole in the middle of the cirles first - then cut the holes out. If you have some utility with your jigsaw to saw exact cirles this is very helpful - mine does not have such a thing - so my circles are not perfect unluckily...