SPARES2GO Universal Window Seal Kit fits Velux for portable air-conditioners. Blocks the return of hot air and reduce the power consumption effectively. Good Sealing & Wide Application: Suitable for portable mobile air conditioners and dehumidifiers. The window seal has a length of 2 metres. Suitable for commonly-used tilting window types no matter whether it open to the left or open to the right, bottom hung windows or skylight. Easy To Install: Simply apply the adhesive hook tape to the inside of your window frame and to the window itself. Attach the window seal to the hook tape. Then, open the zip on the window seal and place your air conditioner hose out of the window. Close the zip tightly around the hose. Dimensions & Contents: Length: 200cm -- Width: 35cm -- Double Zip - Zipped Length: 120mm -- Kit Contains: 2 x Roll of self-adhesive hook and loop tape (affixes to both window frame and window edge), 2 x Complete Window Zipped Seal (affixes to frame tape) Convenience: You can open or close the window at any time without removing the window seal. Once the weather turns chilly, you can also remove it and install it again next summer to save your money!