Airflow direction Performa 475

[Amon_RA]

Maybe a silly question but I noticed that according to the LC service manuals the fan should be installed with the logo side down :



My Performa 475 has a fan installed with the logo (label) side up... which made me doubt on what the the correct airflow direction should be... ?
Should the fan blow the air out of the case (so downwards) or take air in from the bottom of the case?

 

[Phipli]

Maybe a silly question but I noticed that according to the LC service manuals the fan should be installed with the logo side down :

View attachment 54743

My Performa 475 has a fan installed with the logo (label) side up... which made me doubt on what the the correct airflow direction should be... ?
Should the fan blow the air out of the case (so downwards) or take air in from the bottom of the case?

Mine have matched what is shown, but truth be told, it is unlikely to make much difference. I'd just match the manual.

 

[Phipli]

The reason they say that way is for clearance to the impeller from the case.

 

[beachycove]

I believe that Dana, of this parish (and of vhack fame), used to claim on her old Q605-themed website that turning the fan over with a view to expelling the air made her Q605 run cooler. This mattered in her overclocked, FPU-equipped machines.

Anyway, I certainly ran an LC475 that-a-way as a server 24/7 for a long while (at least a couple of years) without incident.