F-Series · Fiberglass
GR70 Dual Action Window
A 70 mm dual-action (tilt-and-turn) fiberglass window — a deeper frame than the GR65 for heavier glass and lower U-values, with the same one-handle tilt and turn operation.
The tilt-and-turn action gives secure trickle ventilation in the tilt position and a full inward swing for cleaning and egress, all from a single handle. At 70 mm the fiberglass frame carries a deeper glazing pocket than the GR65 for lower heat loss.
Technical specifications
| Frame depth | 70 mm |
| Frame material | Pultruded fiberglass, powder-coated |
| Glazing pocket | Up to 40 mm |
| Opening | Dual action / tilt-turn, inward |
| Whole-window U-value, ZERO 04 | 0.100 Btu/h·ft²·°F (0.57 W/m²K), R-10.0, at NFRC size 1200 × 1500 mm Calculated |
| Whole-window U-value, ZERO 05 | 0.104 Btu/h·ft²·°F (0.59 W/m²K), R-9.6 Calculated |
| Whole-window U-value, ZERO 24 double glazed | 0.233 Btu/h·ft²·°F (1.32 W/m²K), R-4.3, within the Massachusetts energy code Calculated |
| Center-of-glass U-value | ZERO 04: 0.044 to 0.047 Btu/h·ft²·°F (R-21 to R-23) · ZERO 05: 0.054 (R-18.5) Calculated |
| SHGC, center of glass | KØLD 0.49 / 0.35 · MILD 0.35 / 0.27 · HEIT 0.26 / 0.20 (ZERO 05 / ZERO 04) Calculated |
| Visible light, center of glass | KØLD 76% / 64% · MILD 67% / 53% · HEIT 61% / 45% (ZERO 05 / ZERO 04) Calculated |
| Air infiltration | Tested to AAMA / NFRC Project-specific |
Certified values are published as NFRC and CSA testing completes. Calculated values come from LBNL THERM and WINDOW models of the specific assembly. Project-specific values depend on size and glass package.
What is a tilt-and-turn (dual action) window?
A tilt-and-turn window, also called a dual-action window, does two jobs from a single handle. Turn the handle one way and the whole sash swings inward like a door for full ventilation, easy cleaning from inside, and a clear egress opening. Turn it the other way and the sash tilts inward at the top only, for secure background ventilation with the opening out of easy reach. All of the operating hardware is concealed inside the frame. It is the standard operable window across Europe, and it is the right choice wherever a window has to both ventilate securely and open wide.
Thermal section (THERM heat map)
GR70 Dual Action Window · Sill. Whole window 0.100 Btu/h·ft²·°F (R-10.0) with ZERO 04, 0.104 (R-9.6) with ZERO 05, at 1200 × 1500 mm. Calculated
Modeled in LBNL THERM 8.1 at NFRC winter conditions, 0°F outside and 70°F inside. The red band on the room side shows the frame and glass staying close to room temperature; the lines are isotherms every 3°C (5.4°F).
Full engineering image ›All sections, ZERO 04 (PDF, 5.9 MB) ›ZERO 05 (PDF, 5.9 MB) ›Every section we model ›
Glass & glazing options
Standard glazing is the hybrid vacuum unit in one of six ZERO packages: three climates, each at two levels. ZERO 05 Daylight admits the most light and solar heat; ZERO 04 Ultimate has the lowest U-factor. For code-level projects, the double-glazed ZERO 24 packages are also available.
| Package | Center-of-glass U / R · SHGC · visible light |
| KØLD 05 · cold | 0.054 / R-18.5 · 0.49 · 76% |
| KØLD 04 · cold | 0.047 / R-21.1 · 0.35 · 64% |
| MILD 05 · mixed | 0.054 / R-18.6 · 0.35 · 67% |
| MILD 04 · mixed | 0.044 / R-22.6 · 0.27 · 53% |
| HEIT 05 · hot | 0.054 / R-18.6 · 0.26 · 61% |
| HEIT 04 · hot | 0.044 / R-23.0 · 0.20 · 45% |
| ZERO 24 KØLD · double glazed | 0.244 / R-4.1 · 0.57 · 83% |
| ZERO 24 MILD · double glazed | 0.241 / R-4.1 · 0.40 · 73% |
| ZERO 24 HEIT · double glazed | 0.242 / R-4.1 · 0.30 · 68% |
Quanex Super Spacer® Premium silicone-foam warm-edge spacer, argon-filled outer cavity.
Triple glazing, laminated and acoustic build-ups are also available to suit the project. Compare the ZERO packages ›
