Tengda AC15 / EX6200 and AC68U: Use the same method to fix it, and the principle is the same.

AC68U: it can be reduced by 20-30 degrees without dust screen, and 15-20 degrees with dust screen. You can only choose according to your own situation.
Fan specifications:
Model: 7015MB05B
Specification: 70 * 70 * 15mm
Bearing: Alloy hydraulic bearing
Voltage: DC5V
Current: 0.20A
Speed: 2100 rpm ± 10%
Life: 50000 hours
Interface: USB
Others: industrial fan, no independent packaging, bulk, factory stock

The fan used is a 7cm fan with hydraulic bearing, which can run without shutdown for a long time. The bearing is not an ordinary oil bearing, so there is no need to worry about the quality. The price is relatively expensive. You can buy a good fan for a penny. It saves a lot of things. You won't worry about it breaking in two or three months. Retail price is not negotiated, you can