60mm, 80mm, 120mm...which is standard cooling fan size?

[Relztrah]

I am buying a couple spare cooling fans online but they are different sizes. I think I want a 80mm which apparently is standard for most cases. Am I correct in this assumption?

Also, does the air flow always go from the side with the label (in) toward the side without the label (out)?

Thanks,
Relztrah

[mjc]

Many cases use 120s...

Most fans have an 'air flow' indicator on them...an arrow that points the direction of air flow. But, yeah, the label is usually a good indicator.

[saphalline]

In the old days of early cooling requirements (Pentium) 60mm was the "standard" for PC's. In the days of the PIII, 80mm became the "standard". Now in this age of quad-core, we're seeing the "standard" switch to 92mm, 120mm, and even 200mm! :eek:

It's all over the place right now. Get whatever fits.