1. 1. Check the Recess Depth

   Measure the usable depth inside your window recess. It must meet the minimum mounting depth shown on the product page. Check for handles or other obstacles that could interfere with installation.

2. 2. Measure the Width

   Measure inside the recess at the top, middle, and bottom. Record the smallest width and enter that measurement as your order width.

3. 3. Measure the Height

   Measure inside the recess at the left, middle, and right. Record the largest height and enter that measurement as your order height, unless your product page instructs otherwise.

Example: If your smallest width is 34 3/8" and your largest height is 57 5/8", enter W 34 3/8" × H 57 5/8" in your order. Do not subtract the factory deduction yourself.

1. 1. Measure the Width & Add Coverage

   Measure across the outside of the window recess at the top, middle, and bottom. Following the illustrated guide, use the smallest width and add 4 inches to calculate your order width.

2. 2. Measure the Height & Add Coverage

   Measure the height at the left, middle, and right. Use the largest height and add 4 inches to calculate your order height.

3. 3. Confirm the Final Coverage

   Check that the planned size covers the entire opening and leaves room for the mounting hardware. Adjust the overlap as needed for your mounting position, trim, handles, and nearby obstacles.

Example: W 34 3/8" × H 57 5/8"
Order size: W 38 3/8" × H 61 5/8"