F-Series · Fiberglass
Glass that behaves like a wall.
Pultruded fiberglass expands and contracts almost exactly like the glass it holds, so seals last and frames stay slim. Twelve systems from the GR65 minimal-frame window to the GR145 sliding wall.
A window has always been the weak point in the wall — the thermal hole every heating and cooling dollar leaks through. Paired with vacuum glazing, an F-Series assembly reaches a whole-window R-22 (U 0.045), roughly the insulating value of a framed, insulated exterior wall. At that point the opening stops behaving like a gap you glazed over and starts behaving like the wall itself: no cold edge, no condensation line, no penalty for going bigger. You get the daylight and the view without giving back the envelope.
Why fiberglass
Pultruded fiberglass is the reason the F-Series behaves the way it does.
Fiberglass is inherently strong, dimensionally stable, and built to perform in all climates. It expands and contracts at nearly the same rate as the glass it holds, so seals stay tight through decades of seasonal swings.
All F-Series systems
Windows, doors, and sliding and lift-slide systems. Every fiberglass frame suits Passivhaus work.
GR60 Swing Door
GR70 Swing Door
GR85 Swing Door
GR65 Dual Action Window
GR70 Casement Window
GR70 Dual Action Window
GR85 Casement Window
GR85 Dual Action Window
GR90 Sliding Window
GR90 Sliding Door
GR132 Lift & Slide Door
GR145 INOWA Sliding Door
Sustainable by material
Fiberglass takes less energy to produce than aluminum, gives off zero VOCs in service, and is recyclable at the end of its life. A durable envelope with a lighter footprint, built to outlast the building's first renovation cycle.
One profile family, many openings
From slim fixed and casement sections to deep sliding and lift-slide frames, detailed as one system across the range.
