Particle System and mesh colision. IDK how should I named it :)

Hello,

I hope I have picked the right Adress for my Point.

I started working with the Unreal Engine 4 a week ago.
Before I worked with “Gamestudio A8”.

But I have a little problem.

I want to create this:

in better.

As you can see the pieces of wood fall down, where the should not fall down.
I want to make this same projekt in better.

I know that you can use the super-cool Particle System with collision by the Unreal Engine 4
,but If I created a “own” particle system with blocks, like in the video
the blocks “disable” or land on the ground and “disable” too.

I search for many information but this two videos can’t help me.Intro to Cascade: Creating a Mesh Emitter | 06 | v4.2 Tutorial Series | Unreal Engine - YouTube

and other results I can’t find.

In all cases the particles fall like in the video 70% to the right position and 30% straight down through the fan and If I looked away. All particles go straight down.

So my question is How can I create this?

Regards UnrealCry