[More Reliable Design] This Portable Air Conditioner Door Vent Kit is specially designed to the drawbacks of zipper type whose seal is lacking, zipper bursting and slipping, and complicated installation. Simplify the design and structurer while improving the reliability of the product. At the same time, we use solid materials, double-stitched thread and widen the Nylon Sticker and tape to further enhance the adhesion and sealing, truly and practical. [ Sealing Effect AC Door Kit] New drawstring structure design allows the sealing fabric to better fit the exhaust, no additional accessories required, achieving sealing effect of true "0" , firmly locking the cool air inside while also blocking out heat flows, rain, mosquitoes bugs etc. In addition, we also keep a section of the zipper opening to meet your needs for different size exhausts and multiple exhausts at the same time. [Universal Size] suitable for all kinds of and tumble dryers. [Tips & Service] 1. Clean off the dust at the door frame before applying the adhesive. 2. It is best to leave it for 24 hours after installation before use.