Key benefits Prevents cold air from escaping and keeps outside heat and sunlight out, so portable ACs or air dryers cool more efficiently and run less. Creates a tight, gap-free seal that also blocks insects and dust from entering through the window opening. Adjustable and easy to customize for different window types and hose positions, reducing installation frustration and preventing tape from peeling. Product features Two adjustable lengths: approximately 300 cm and approximately 400 cm to suit different window openings. Compatible with all portable air conditioners and all air dryers; fits sliding windows in both horizontal and vertical orientations. Made from special TU fabric treated with a heat-insulating bleaching process to reflect heat and help maintain lower indoor temperatures. Expanded firm adhesive tape provides secure attachment and a durable seal. Precision-cutting and routing areas allow clean trimming and repositioning without distortion. Texture treatment around the hose outlet keeps the tape in place after inserting the air hose, eliminating gaps and slippage. How it solves common problems Stops conditioned air from escaping through gaps around the exhaust hose, improving cooling speed and reducing energy use. Reflects sunlight and outdoor heat away from the room rather than absorbing it, which helps the air conditioner work less and lowers running costs. Prevents insects and dust from entering through gaps left by portable AC installations, improving indoor comfort and cleanliness. Allows neat, durable installation even on irregular or sliding window tracks thanks to adjustable length and firm adhesive. Practical applications Use with a portable air conditioner in a living room with a sliding window to keep cool air inside while exhausting hot air outside. Install with an air dryer or dehumidifier in a laundry or utility room to route exhaust without letting insects or outdoor dust in. Fit to vertical sliding windows in bedrooms or offices to maintain a sealed opening for temporary or seasonal portable AC use. What to expect during installation Measure the window opening and choose the approximate 300 cm or 400 cm length that covers the gap. Trim along the marked cutting and routing areas for a precise fit around the hose and window frame. Press the expanded firm adhesive into place on the window frame or sash; the textured outlet area stabilizes the hose insertion and prevents tape drop. Materials and performance TU fabric with heat-insulating bleaching process for reflective, insulating performance. Strong adhesive backing for a secure, long-lasting seal that resists gaps and movement. This air conditioner gasket provides a practical, adjustable sealing solution for portable AC and air dryer setups, improving efficiency, comfort, and cleanliness without complex installation.