[SOLVED] Older Cases w/single fans. Air Flow in or out?

[rapiddecline]

1 Pc case has 60mm fan with in flow thru 102 1/8" dia. preforations on each side. ( Note case fan spot is limited to 60mm fan size)

The other pc case has 5"x12" perforated opening near case rear and 4 rows of 1/16 " x 1/4" perforations on each side(near hdd slots). ( The fan size can be increased .)

Neither unit runs hot.

Both unit sit on floor of residence and collect a small amount of dust within 6months clean cycle.

Would the air flow be better if the case fans provide in flow instead of out flow?

Also both psu have 120mm fans providing out flow to the psu exhaust fan.

These are basic pc no gaming.

Thank you.

 

[anotherdrew]

Convention is to have the fan blowing out.

If you had a fan pointed directly at a hot object, then blowing on it would be more efficient than sucking air away from it (the exception would be air that is sucked through a heat sink via a shroud). That is probably not the case.

According to Gay-Lussac's law pressure and temperature are directly proportional. So, a fan blowing in, resulting in higher pressure inside the case, would increase the temperature. A fan blowing out, resulting in a lower pressure inside the case,, would lower the temperature. How much depends on your fan. Is it enough for you to notice? Probably not.