Amazon.com: Tinker3D Antminer S19 T19 S17 T17 Double Fan Shroud 6 Inch Outlet to 2X 4 Inch Round ASIC Miner Air Cooling Duct 2X 120mm USA Made (1) : Electronics
60, 80, 120 mm fan cover/duct with 90 degree deflector by jimb15122 - Thingiverse
120mm Fan Duct Cooling Shroud Adapter To 125mm Vent | eBay
2PCS Fan Shroud Duct Cooling Ducting Vent Shroud Ventilation 120Mm for Bitcoin Antminer 4 Inch Fan S1 S3 S5 S7 S9 L3+ - Walmart.com