Airflow fan change for TEVO Black Widow PSU

The standard PSU fan of the Tevo is very noisy. So here is a change for assembling 2x 40mm fans with 24V and a step down modul. The 2 40mm fans are running at 16V and the noise reduction is very great. Alternativ also 2x 12V fans could be used with a step down modul, there is no need for 24V fans.
There are 2 versions:
- air flow box complete
- air flow box without ground plate and
- separate groundplate
if someone want to modify the height