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 | 0.13 W/m²K Calculated |
| SHGC | 0.20–0.50 by glass Project-specific |
| 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.
