seal up the area and either push or pull air through the filter to where ever you want the air to vent to... have you read the grow faq? https://www.rollitup.org/view.php?pg=faq
you gonna need a higher CFM fan, and bigger carbon filter. I have 178 CFM fan from Canfan, and a carbon filter by same company for a 4X4, and i should have more.