Size Guide: Please refer to the picture to measure the lengths of the three sides of windows A, B, and C and add them together. A+B+. C=3.5~4 meters, choose 4m, [Good airtightness and wide range of applications] Suitable for portable mobile air conditioners, clothes dryers, exhaust dryers, and dehumidifiers. The dimensions of the window sealing strips are 3m, 4m, and are suitable for casement windows. Note: It cannot be installed on sliding doors and windows. [Easy to install] No drilling or other tools required. Simply stick the adhesive tape to the inside of the window frame and to the window itself. Stick the window seal on the adhesive tape. Does not affect the opening and closing of windows. [High-quality material] 90T polyester, waterproof and environmentally friendly PU coated fabric. Self-locking zipper, excellent adhesion, no marks when tearing. It can also effectively isolate insects, dust, etc. of the room. [Convenience and Economy] You can open or close the window at any