Please help this newb

[Fro20]

Hey guys, I am trying to figure out what to set my co2 regulator at, my room is 15'x11'x8.5'
I have one fan drawing air out at its an 8" 720CFM fan, other than that the only air Going out is from the space under the door, and the air intake is from a 12,00btu airconditioner.
I'm trying to figure out what to set my co2 regulator at.
I'm pretty sure only info needed is the 720CFM fan drawin out, and the space under the doors, anyone have a formula or know the answer what to set my regulator at?!?
Please help!!
Thank you!!

 

[MRXC]

I beleve it was between 1000/1500 ppm and youl need the overpower of the light to make it worth your wile aswell as you have to have your room temp high between 30/35c

 

[Fro20]

I know you want it to reach 1500ppm's that's not what I'm asking.
In asking what to set the regulator at to achieve 1500ppm's given the factors of using an exhaust fan that is rated 720cfm's