Well finally managed to get a rack today. Had to go to the kitchen section of the supermarket
3 tier stackable wire rack. Heres the set up:-
Base level under he first rack is open.
First rack up has a 120mm fan on.
Second rack has two U3's on.
Third rack has the rm1000 (fan facing up) with the a gecko stick as the cherry on top keep cooling thanks to the rm1000 fan.
The u3's and psu are staggered so the 120mm fan blows onto the u3's and half the hot side of the psu, plus the u3's draw air down from the other side of the psu.
Sound ok or should I have the fan facing down on the psu?
I thought hot air rises to more chance of the heat being forced out the back of the psu if the fan is facing up