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There will be approximately 400cfm being drawn in from the side panel. That air has to go somewhere so it is time to take the "lid" off the case (another nice feature) and install two 120mm YS-Techs (131.5cfm) as top exhausts.
These two are going to have to be real close together to fit in the lid so I tightly tie wrapped them together.
Again, the piece is firmly clamped in place and the cutting fluid used.
After deburring the edges, we have two perfect exhaust holes. Note how close they are together. If the metal was thinner, I think it probably would have torn from putting the holes so close.