Vi6.
Quiet, tight and strong. The 82 mm (3-1/4″), six-chamber window with concealed hinges and a steel core.
The numbers.
The highest each rating has reached in the lab, with the report behind it. Your sizes and your glass set the numbers for your building, and we give you those exactly.
Casement window. Structural, water and air: Intertek report S3614.03-525-44. Energy: NFRC CPD VST-K-4-00221-00001. Sound: Intertek report J4759. Each best value comes from its own glass — pick yours below. Other types have their own class; see Made for strength.
Three ways to glaze it.
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Open it to see
the hinge.
The hinges sit inside the frame. Closed, the window shows no hinge, no cover cap and no knuckle, inside or out. They only come into view when the sash is open, as it is here. Behind them, every sash and frame carries a steel core inside the uPVC.
Everything to specify it.
Open to everyone. CAD files and the submittal builder need an architect sign-in.