BIX and fans in vertical way
 

Can I use a BIX with two fans ("push-pull") in a vertcal way? Thank you everybody.

By vertical do you mean the surface area that is exposed is perpendicular to the ground (the air flows horizontally) or that the exposed surface area is parallel to the ground (air flows through vertically). Slightly confused but I believe most people run their radiators "standing up" or perpendicular to the gound. If you're running the radiator so that its surface is parallel to the ground the only thign to watch out for is that since heat rises pushing the air down through the radiator might be slightly less efficient than pushing the air up through the radiator. Other than that *slight* issue, i think both ways are equally do-able.

Sorry, I meant " the air flows horizontally". It's happened - I have two BIXs. So I want to fit them outside of my case (on the top of it) - with the horizontally air flows (4 fans 120 Papst 7v). And a reservoir with an Eheim 1250 in line - above the BIXs. My PC is under my table (in a cabinet with a closed door). A question - maybe it's better to fit my pupm in the case (on the bottom)? Who can answer? Thank everybody again.

I still dont get it.......

Draw a simple diagram picture of your intended setup.

Ideally, I believe that the rad should sit vertically, to where the inlet and outlet are on top. I don't believe that it would make much difference otherwise, except for possibly trapping air when the system stops.