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Oh yes, I just decided to check your website. Without a link in the original posting it didn't dawn on me to look.
How do they handle sealing against air leakage? I assume there is some effort required to operate them.....
As a designer, I have had inquiies about this sort of door but never tried one given my harsh climate. I know tey are somewhat common in nicer climes such as Hawaii for their Lanaiis