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I'm new in the forum and I have some doubts to create my grow room with an hvac system. Can i tell you what mine would be like my set up and you would help me? Thank u so much!!

i'm new to the forum but i read the full thread. I liked your set up and and you have great results, so I will try to replicate it in Brazil, but i I have some questions, if you can answer me.. what size of ft tall of your grow room? I read that you use co2, do you use an exhaust fan in this...