Ok I am framing out a 8x8 room and then wrapping each wall with poly then I will put it together. Any ideas on making a door that is airtight? I was thinking a tarp zip up kit running vertically on ecah side of the door and then a velcro strip running horizontail across the bottom of the door frame to connect the bottom. Any thoughts or ideas on doing this or a better way to do it. Any Tips when building a POLY room? Thanks Guys