Easy to Insatll: No drilling and no tools are required.1. Open the sliding window and clean the dust from the frame.2. Measure the four sides of the sliding window and cut the Velcro tape.3. Tape the tape to the window frame and attach the sealing cloth to the tape (the excess length of the sealing cloth can be cut off with scissors or rolled up and secured with clips).4. Thread the exhaust pipe through the cuffs, tighten the pull cords, and secure it with the aid of a zip-tie. Wide Applicability: please measure the circumference of the window you are opening to make sure the fit is right), for horizontal/vertical windows that open outward or inward, and does not apply to horizontal or vertical sliding windows. And use with all portable air conditioners, dryers and dehumidifiers etc.