120mm media door fan vent beauty ring.
thingiverse
Most doors are hollow today. This provides an aesthetically pleasing way of adding the fan to your door. drill a 4.5" hole with a hole saw. press this ring in your door. screw the fan into the door on the back side with #8 x 1/2" wood screws. Use a silent fan and a 1Amp 12v wall wart supply. voila instant media closet fan porthole!
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