Are you using internal fans? It looks to me like your fans are mated flush to the box, so there's no way for air to flow into the inlets. Can you upload your model to the forum? It would help.
Also, there is a specific forum for Flow Simulation, you should post your questions there in the future.
Thank you so much for your time and help.
Yes the fans are mated to the walls but I dont know if is that the problem.
I didin´t use the inside fans, I have tried but a message appear saying that the fans is not laying on the boundary between solid and fluid region. I have created a rotary region as I saw on youtube tutorials.
I have attached the assembly and I have moved the topic to a correct area.
There are two types of fans you can use in Flow Simulation:
1. External fans. These fans are used for internal flow problems. They are represented by a single face that lies on some solid geometry. They represent outlets and inlets to the universe and will bring fluid mass into/out of your system.
2. Internal fans. These fans are used to move fluid inside the domain of your simulation. They must have two faces, one for the fluid to enter and one for the fluid to leave. These fans will bring energy into the system in the form of additional pressure, but they do not bring any more fluid mass into the calculations.
Both of the "fan" boundary conditions are used to simplify your simulation, they do not involve any of the rotating reference frame features of the software.
I'm going over your model in more detail, I see a lot of first time mistakes here such as not simplifying enough, misuse of rotating reference frames, too many unnecessary small parts such as hardware, etc...
Before you jump into a practical application you need to learn the software. I would recommend checking with your vendor to see if they offer lectures. In the meantime, go to online help and start going through the tutorials. They do a great job of introducing the basics.