This will let you connect your Bitmain S9 to a standard 6" flexible duct and move the heat where you want it. The duct is offset so that the mining chassis can still sit on a flat surface. It is designed to replace one of the fans. Depending on application, shorter screws may be needed or you may damage hashboards
https://cults3d.com/en/3d-model/various/bitmain-antminer-s9-flexible-duct-adapter