ModelDiameter of the tubeOutline Dimension Length×Wide×HeightFixing Size (Hexagon Socket Head Screw)The Max. Power of CompressorAir volume of fan MotorFK388-320Φ8320×130×235 170×55(4)under 220W≥400(33W)MFK8-320Φ8320×130×265170×55(4)under 220W≥650(40W)MFK8-360Φ8360×130×265170×55(4)under 220W≥650(40W)DFK8-400Φ8Developing170×55(4)under 220W≥1300(75W)DFK68-400Φ8Developing170×55(4)under 220W≥1700(70W)MFK8-520Φ8520×130×265170×55(6)under 220W≥1300(40W*2)FK8-660Φ8660×130×285170×55(6)under 220W≥1700(60W*2)