Enhance Cooling Performance: This ac window seal kit can tightly lock the vent hose of your portable air conditioner between the window and window frame, effectively expelling the hot air out of the window, firmly locking the indoor cool air while preventing outdoor hot air from flowing back, also keeping out rain, mosquitoes, bugs, etc. Flow fire 400cm Portable Air Con Window Seal Kit Why choose us 1. The air conditioner window kit helps to direct warm air out of a room through a hose, reducing energy consumption and cutting carbon dioxide emissions while cooling your room down more efficiently and saving on your electric bills. 2. Material: Thick waterproof polyester, fully sealed and thickened with silver coating, high temperature.resistance, and sun 3. UV index up to 90%, creating a comfortable sleeping 4.