The fan was made of PBT material,normally we use RoHS material,but also can do UL certificate material,that object to your request.
Fan datasheet
| Model | Rated Voltage (V) |
Current Amp (A) |
Speed (RPM) |
Air Flow (CFM) |
Air Pressure (mmH2O) |
Noise (dBA) |
Weight (g) |
(FG) Tachometer Output |
(PWM) Pulse Width Modulation |
Auto Restart |
| 4020L | 5 | 0.04 | 3000 | 1.16 | 1.38 | 25.7 | 23 | √ | √ | |
| 4020M | 0.15 | 6000 | 2.43 | 6.55 | 35.1 | 23 | √ | √ | ||
| 4020L | 12 | 0.02 | 3000 | 1.16 | 1.38 | 25.7 | 23 | √ | √ | |
| 4020M | 0.07 | 6000 | 2.43 | 6.55 | 35.1 | 23 | √ | √ | ||
| 4020H | 0.16 | 8000 | 3.2 | 13.30 | 42.0 | 23 | √ | √ | ||
| 4020M | 24 | 0.06 | 6000 | 2.43 | 6.55 | 35.1 | 23 | √ | √ |

See below picture of our fan installed to 3D printer

Fan Curve

How to choose the fan bearing type?
1)If you want economic one,and can accept shorter lifespan,then we suggest you'd choose the sleeve bearing fans,but it doesn't means sleeve bearing not good,it's good also,compare to ball bearing ones,one is good,one is better;
2)If you are strict on the performance and longer lifespan,or you need do the waterproof version,the ball bearing fans are your best choice;
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