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Solved it, in had a grill on my 4 inch exhaust. I think it was restricting the air flow. I cut it out and the flow seems a lot better. And its cooling my cabinet way better now. Temps low 80's now.

Hey guys/ladies. Im new to the site and to growing. Ive done a lot of research and i built my first grow box. Its 24" wide 32" long and 36" tall. Ive made a carbon filter that's hooked up to a 4 inch duct booster for my exhaust. I have 2- 4" holes cut into the bottom of my grow box for intake...