Are they worth the money?
Just looked at a 92mm one and its £20 which seems a little too much! It does have quite impressive specs though:
Model: Papst 3412 N/GL
- Airflow: 35.9 CFM
- Nominal Voltage: 12(DC)
- Voltage range: 8 - 15(DC)
- Noise: MAX 23 dB Min of 12dB
- Sintec Sleave Bearings
- Power input: 1.2W
- Nominal speed: 1950rpm
- Lifespan at 40C: 80,000hrs
- 3 pin connection
35.9 CFM at 23dB