Ventilation for a Co2 setup????

Hello everyone. I am a fairly new grower, have had a few good grows but I know I can do better. I would like to add Co2 to my system but dont wanna waste the money if im just wasting Co2. Here is my problem.... In my bloom room I only have 1 exhaust. (my room is surrounded by brick and that's the only one I could fit) I have my hood, portable a/c and a dehumidifier all venting out that exhaust.
 

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