- A+ energy Rated as standard with a best in class U value of 1.4!
- Argon filled sealed units with black warm edge spacer bar between units
- 10 year guarantee
- Very high WPR (weather performance rating)
- Compliant to Part L building regulations
- 128mm thermal efficient multi chamber frame
- Internally beaded for maximum security
Please enter the frame overall size including any cill and/or frame extensions (if required). We recommend deducting 10mm from the overall size for clearance/ease of installation.
How do I measure? Firstly measure the width in millimetres and then the height using a tape measure. Enter overall height including existing sill unless it is NOT going to be replaced, I.E. A concrete sill is present All frames are viewed from the outside.