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INSIDE MOUNT MEASUREMENT: Step 1.Measure the inside frame width at three locations-the top,middle,and bottom. Record the smallest of the 3 measurements and use that number deduct 0.25inch as your inside width when ordering. Step 2.Measure the height at 3 locations-the left,middle,and right side. Record the smallest of the 3 measurements and use the number as your inside width when ordering. OUTSIDE MOUNT MEASUREMENT: Step 1.Measure the outside frame width adding 3-6inch to be the outside mount width. Step 2.?Measure the outside frame length adding8-40inch to be the outside mount length. The overlap it recommended to allow appropriate coverage and avoid any light gaps. Type:Solid color roller shade. Feature:Blackout Waterproof Material: Fabric Installation:All Mounting Hardware Included.