Peter,
While I have used a 16x20 for 11x14s, I have always like more matting around a photo that size. Unfortunately, that means getting into non ready-made sizes. I have some 11x14s from Roman Loranc that I put into 20x24 frames. Regardless of whether the image is horizontal or vertical, all the mats are in vertical orientation which gives a nice look and allows for a nice presentation. Not all people like that look, but I do.
When I mount and frame exhibition prints, I use the Golden Mean ratio to determine the width of the borders. Bottom border is 1.6 times the width of the top and sides. I determine these dimensions for an 11X14 in a 14X18 vertical frame and in a 15X17 horizontal fame. I think that presentation of the image is "comfortable" within the borders, not "over-matted" or "under-matted" and produces a sense of three dimensionality which leads the viewer into the image, and helps to keep it there. I use the same procedure if the image is square or panoramic.
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