hello! I am interested in how much cfm ventilation i need for my grow box grow box size 0,40 x 0,40 x 0,80 (m) and i interested how large size need for carbon filter (homemade) ?? please help and what cfm ventilator need for pull out air through carbon filter..? Help! And i could use pc ventilator for pull out air through carbon filter..? very bad to go with the English language. Sorry..
well if youre building your own, google homemade carbon filter. they make it with some pen holders or something. If I was you id buy a 4 inch phresh filter, they don't cost that much