1 How to Choose the Right Size Inside Mount: Measure the exact width and height of your window frame, and order the same size. We will automatically deduct 3/8" from the width to ensure a perfect fit inside the frame. Outside Mount: Measure the width and height of the area you want to cover. To ensure full coverage and better light blocking, we recommend adding at least 4 inches to both the measured width and height. 2 Engineered Wood This faux wood blinds feature high-quality synthetic wood slats that provide the natural look and feel of real wood, but with enhanced durability and easy maintenance. The synthetic wood material offers superior resistance to moisture, corrosion, and warping, ensuring that the blinds remain in great condition even in humid or dry environments.