Choosing a fan for DIY stir plate

[ALExanderH]

Hi, I just harvested three fans and two magnets from an old desktop PC.
I am just wondering which fan should I go with since there were three different sizes. Small, medium or large?

 

[4TBBUCS]

Depends on which fits the enclosure you choose to use best. Make sure to check each fan's specs as well, in order to match it to an appropriate power adapter. I used a 120mm in a 6"x4" project box. Works great!