- Adjustable design: Our portable AC vent seal is available in two lengths—300 cm and 400 cm—and can be cut to size for a perfect fit. It fits all sliding windows, horizontal or vertical, and works with all portable air conditioners or dehumidifiers. Measure your window and trim the sheet to match. - Superior insulation: Made with TU fabric for thermal insulation and treated with an innovative heat-insulating process. It blocks cold air loss and reflects sunlight away from your home. Expect faster cooling, lower energy use, and reduced electricity bills. The material forms a thermal barrier that maximizes AC efficiency. - Complete sealing solution: High-quality material and extended strong adhesive ensure a tight, gap-free installation. Keeps cool air inside and insects out. Reinforced edges retain their shape with frequent use, making it reliable for seasonal cooling. - Engineering: Exact cut and milled areas allow distortion-free adjustment. The texture near the outlet prevents the seal from loosening after inserting the exhaust hose, reducing gaps and maintaining seal integrity throughout the season. - Easy installation: No tools required. Attach the loop strap to the window frame, apply the seal along the adhesive strip, position the exhaust hose, and close for optimal sealing. Suitable for any homeowner seeking to improve portable AC efficiency and reduce energy costs.