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. Eight systems from the GR65 minimal-frame window to the GR145 sliding wall.

See all F-SeriesPerformance
GR85 fiberglass casement profile section
R-22Whole-window insulation, wall-level (U 0.045)
8Fiberglass systems, GR60 to GR145
PHIUSPassivhaus performance, GR85 tested & rated
0%Rot, rust, warp — fiberglass is inert

All F-Series systems

Windows, doors, and sliding and lift-slide systems. Every fiberglass frame suits Passivhaus work.

GR65 Dual Action Window
F-Series · GR65

GR65 Dual Action Window

Window · Dual Action · 65 mm
GR70 Casement Window
F-Series · GR70

GR70 Casement Window

Window · Casement · 70 mm
GR85 Dual Action Window
F-Series · GR85

GR85 Dual Action Window

Window · Dual Action · 85 mm
PHIUS Rated
GR85 Casement Window
F-Series · GR85

GR85 Casement Window

Window · Casement · 85 mm
GR60 Swing Door
F-Series · GR60

GR60 Swing Door

Door · Swing · 60 mm
GR90 Sliding Door
F-Series · GR90

GR90 Sliding Door

Sliding · Sliding · 90 mm
GR132 Lift & Slide Door
F-Series · GR132

GR132 Lift & Slide Door

Sliding · Lift & Slide · 132 mm
GR145 INOWA Sliding Door
F-Series · GR145

GR145 INOWA Sliding Door

Sliding · Sliding · 145 mm
PHIUS: all F-Series frames are suitable for Passivhaus projects; the GR85 Dual Action is the system tested and rated to PHIUS today. Each system opens to a layered page with the profile section, key facts, and specifications.