michael_thm
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How would you fix the prefab steel plate on the fan metal plate? The thickness of the plywood is needed so that the screws can fix the fan metal plate to the plywood.
The inner 50mm circle is for the wires to pass thru. The inner 4 bolt holes is to secure the steel plate to the base plate. The outer 4 bolt holes is to secure the steel plate to the expansion bolts drilled into the ceiling.Then u oso have to drill hole on the ceiling for the bolt to go into the base plate mah
PS. Diagram is wrong in dimensions. Got flaw. the inner 4 bolt holes has to be inside the diameter of the BTO light hole. Meaning shrink the circle to radius 20mm and inner bolt holes 25mm away from center of circle.

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