We installed these on my patio door with a long narrow window. I ordered them because I could order a very specific width and for the amount of light they let in. They do the job really well. Definitely measure precisely because they came exactly to the width I ordered. 

My one small disappointment is that the white is not a bright white. It is more of an ivory and the color difference is noticeable to me against the white door. But it’s ok. I understand why that is, and it doesn’t look bad. Just not exactly what I expected.