Internal Volume for greenhouse

Hello
I hope you are all doing well.
I want to build an internal volume for my greenhouse area. it has a moisture pad from one side and two 45000m3/day fans on other side.
can you please help me on it?
project link:

Hi @elham1986, thanks for posting

Here is a project where I’ve generated the flow volume. It looks like this:

You just need to select a proper seed face/boundary faces as described here.

Cheers!
Igor