BITMAIN Antminer S7 S9 E3 T9 L3+ D3 A3 V9 X3 120mm to 125mm 5" Fan Duct Adaptor
120mm Fan Duct Cooling Shroud Adapter To 125mm Vent. Perfect for keeping temperatures low and increasing cooling efficiency, designed to fit the standard 120mm fans using screws this will allow you to reduce heat and noise in the room.