I don't have any reference material on the shutters. Just remember seeing any playing with them when the wife and I were over there on vacation in the 80's. The ones I remember were kind of like a tambor door construction, but made of aluminum. They rolled into a box about 7" in height mounted above the window. there was a "tape" that was mounted on the inside. when you held the tape and moved it up, the panel slid down the tracks on the outside. This was on windows that were about 36" across and maybe 50" high. TRhe memory's a little fuzzy after 20 + years.