Quote from: NotFuzzyWarm on May 14, 2018, 03:00:40 AM

Don't hold me to it but AFAIK for a s9 that is a free flow in & out of around 250 cfm. Considering the fans are already working hard to keep reasonable temps, raising the work load by adding adding resistance (passive ductwork) will only reduce the airflow and result in higher chip temps.

I understand what you said and it is logic. I agree with you that putting more work to the fans is bad. The fans are already pushing air out. The idea was to know the pressure to see if that force was enough to push the hot air outside trough a big duct.

Quote from: fanatic26 on May 14, 2018, 03:36:07 PM

Ducting into and out of an S9 is usually a bad idea. IF you have to do it, use at least a 6" duct, at 4" there is restriction and overheating.

I am planing to use a big duct, rectangle maybe 24in wide and make the S9 blow the air inside and push it out.
That the reason why I wanted to know the static pressure