Fan support for Modular Mounting System (2194278) - 80mm fan

That's an add-on for the Modular Mounting System (thing: 2194278), that allows you to fit an 80mm standard fan, that could be useful to cool your 3d printer electronics or whatever.
It fits perfectly in the mentioned element, so it's easy to use whatever you want to do with it.
There's two versions:
_The one with "no button", that means it's just the support for the fan.
_The other one, it has a specific little part to attach an standard little switch wether you want to activate or deactivat