how to set different kinds of inlet air component,
 

Hi everyone,

I am using FLUENT to simulation indoor air ventilation now. I have two questions during my simulation.

1. I wanna set several components of the inlet air. (for example set 28% oxygen in the air) How to set it?

2. After calculatoin, I want to see one of the components concentration in the volume. How to use the software to see that? (please give me the detail procedure)