Kommerling Premiline 70 mm inline patio

We've over 23 years of inline patio door fabrication and the first thing we noticed is that the Kommerling Premiline door contains significantly more pvc-u than any other pvc-u patio door we've ever seen. That's a really good thing for a patio door to have as the primary requirement is the rigidity of the sash and outer frame profiles. Infact it makes other pvc-u inline patios look decidedly lightweight by comparison.