VEVOR BT-RTR25-AC1 Bedienungsanleitung Seite 7

2.2.Put the fan into the hole, mark 4 points on the wall through the 4 screw
holes of the fan; drill holes at the 4 points, the inner diameter of the hole is
6mm, the depth is 30mm; then increase the inner diameter of the central
hole to 195mm. Pay attention to the direction of fan wires.The size of the
installation port after processing is shown in the figure below, with
millimeters as the unit. The holes are distributed centrally.
3.Tap the four plastic expansion screws into the four small holes.
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