Fan Box with fan inside.
Fan Box open.
The PDF pattern has instructions to make the box the way the top of this box was made. It has an inside wall which covers the seam allowance of the side wall. The bottom of the box above was not made with an inside wall and you can see the seam allowance from the fabric that covers the sides of the box bottom. I think it’s a much better way to construct a box on looks alone but you also get the strength of two walls.
Fan times 2.