I just bought a 20 foot inflatable screen. I am absolutely in love but the only "vent" to let air out is the same duct that you plug the blower into. The thing literally takes like 6 hours to fully deflate. Even when I squeeze and step on it, the air just moves to another area lol it's super frustrating!!! I tried to roll towards the duct but the air just floats around the base under the screen. The problem is there's no way to go inside of it. Can such a zipper still be added?