Size Buying Guide: Please refer to the picture to measure the lengths of three sides of windows A, B and C to add them up, A+B+. C=3.5~4 meters, choose 4m, [Good airtightness and wide range of uses] Suitable for portable mobile air conditioners, clothes dryers, exhaust dryers and dehumidifiers. Window seal strip sizes are 3m, 4m, , 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 tape to the inside of the window frame and the window itself. Stick the window seal to the hook 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 off. It can also effectively isolate insects, dust, etc. of the room. [Convenience and economy] You can open or close the window at any time without removing the window seal. Once the weather gets cold, you can also take it down and reinstall it next summer, completely reusable! Suitable for all portable air conditioners and dryers.