I don’t put mine through the entrance, I put it under the screen. I pull out the slider, and slide in a double sheet of roofing flashing which I have cut to size to fit. The 20 inch rolls of flashing that you can buy in Home Depot, Ace hardware etc are perfect for this. I cut double the width I need, then fold it in half to make it stiff enough. I leave the slider out, so that it doesn’t melt. 
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