Anyway, there are the same as rules to limit your decision concerning numbers. The U Factor ratings for windows run from .20 through 1.20 along with the lower the U Factor the far. Now that I have given you this over view here is the real thing. http://[email protected]/baohiemthatnghiep/Redirect.aspx?sms=90bb20bb20tbb20thc3B4ng&link=http://Camillacastro.us/forums/viewtopic.php%3Fid=377982