... YD166—47U With the two pieces of layer board, and 40 sets of screw, fan 2 37U600*600*1800 YD166—37UWith ... the two pieces of layer board, 30 set screw, fan 2 32U 600*600*1600 YD166— ... 32UWith the two pieces of layer board, 30 set screw, fan 2 27U 600*600*1400 YD166— ... *1000 YD166—18U With the one pieces of layer board, 20set screw, fan 21. Can tear open outfit type composite ...