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The ultimate solution to this problem is AirLock - an ingenious innovation that is simply brought in place between the window and the window frame and which then regulates the air exchange Airfficently and Locks out pests and keeps out the rain. Whether for windows that open to the left or windows that open to the right, bottom hung windows or skylights - these perfect air exchange guards fit all normal Install instruction 1.Clean up the dust from the window with cloth and then stick the velcro in the window stainless steel edge; 2.Stick the "Airlock" with velcro along the window stainless steel edge; 3.Open the "Airlock" zipper and then insert into the air conditioning exhaust pipe. Package 1x Airlock Window seal+Install Instruction Please measure the three side's long when window open, and make sure the Lamigo Airlock's perimiter is not less than the three side's long(total long=A+B+C).