bitmain antminer l7 9500mh z15 miner m21 56th buy antminer s9 asic s9 se m30s+ asic miners canaan avalonminer 1066 bitmain antminer t17+ value goldshell kd5 in stock t19 antminer antminer t17+ 58thIt is possible to reduce the fan speed by positioning your Antminer in a very cooler atmosphere. A great basement or air-conditioned place might help.ROI