Cooling FanDIY Ventilation Project for GPU mining rig, router, rack receivers, cabinet, av equipment modem, chassis, amplifiers, server workstation, computer pc case, greenhouse, mushroom growing or as exhaust fan for freeze dryer, vent martha tent, terrarium, gaming consoles/devices. Window ExhaustHave a wide arrange of applications and options there. You can use the fans two by two together or four side by side. As a replacement window fan can be placed one forward and one reverse to complete the push and pull of air. Variable Speed AC to DC 12V Speed controller Input: AC 100V - 240V 50/60HZ Output: 3v - 12v 2A Plug-and-Play, Easy Installation. 120V Fan240 x 120 x 25 mm (9.44 x 4.72 x 1 in. ) x 2 Speed: 900 to 3000 RPM x4 Airflow: 45 to 92 CFM x4 Noise: 22 to 37 dBA x4 Rated Current: 0.45A x4 Bearings: Dual Ball Dual Ball BearingLong-term work. Long life-50,000 Hours. computer fan with 4.9 feet AC plug.One-yea