Namikaze

Thanks for your help, the fan is AeroCool, 12x12: and the problem with the screw profile in the box:

Thank you for your answer, my problem is that the bottom of the box has not made holes with screw profile, there are holes, but not subject to the box, then the screw stays "crazy" The fans are older than I had at home My difficulty may come from the type of fan? Regards

Hello, First, I apologize for my English because it is very poor For less fans, in case you want to put 2 of 12x12cm, how are anchored to the box? With screws and nuts? Thanks for the help. Regards