Use screws to attach the unit’s flange to your sash. Applying supplemental screws, connect an L-shaped bracket to connect The underside window sash to the best window sash. This could avert the window from accidentally opening. Only use a registered, reliable installer who is certified in refrigeration and air conditioning. https://airconditionerinstallatio86308.blogdomago.com/28881818/the-basic-principles-of-air-conditioner-installation