Five-chamber PVC profile with a depth of 70 mm and a double-glazed unit up to 41 mm. Provides high energy and sound insulation (Uf ≈ 1.3 W/m²K, Rw up to 45 dB), resistant to wind and water (4/9A/C5), protects against burglary (RC2-3), has a smooth HDF surface and a wide choice of designs.
- Number of air chambers: 5 (in the frame and sash)
- Installation depth (profile thickness): 70 mm
- Maximum thickness of the double-glazed unit: up to 41 mm
- Thermal insulation Uf up to 1.3 W/m²K / Uw ≈ 1.3 W/m²K
- Sound insulation Rw up to 44–45 dB
- Air permeability: class 4; Water resistance: class 9A; Wind load: class C5/B5
- Burglar resistance: up to class RC2 (possibly RC3 with additional protection)