13 feet is 156 inches. Assuming your screen dimension of 100" is width, then the throw ratio is 1.56. This would be considered short throw. However, short and long are relative terms and the ranges vary, you should verify that the throw ratio you need is within the range of whatever PJ you buy. You can use the Projection Calculator at www.projectorcentral.com to check if the PJs you are looking at will work with your setup.
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