recirculation inlet
 

I’m using fluent to simulate room including the human body; the chemical species are (CO2, H2O, N2 and O2) into the air flow from inlet 1, another one inlet 2 (recirculation inlet) connecting with outlet1 by duct and outlet2 with pressure outlet. The velocity domain is set up with velocity inlet 1, inlet 2 (recirculation inlet) and outlet1 (recirculation outlet), finally outlet2 (pressure outlet). When I setup the recirculation inlet the species of H2O is 0.01, N2 0.77 and O2 is 0.22 the results of CO2 concentration in inlet 2 was very high. Where is the problem in my set up? refer to the attachment below.
Attachment 54423