We, too, thought we would never enclose our lanai because we liked the open feeling. However, we tired of the rain & dirt & puddles of water after a heavy rain that we had to mop up or sweep out through a tiny space between the concrete. So, we got the best of both worlds & had full-length acrylic sliders installed last Sept after 4 long years. Since they are full length we get a lot of ventilation and can adjust how many sliders to open depending on the weather. We wish we had done it sooner.