UPVC roof window DXC-C P4 SECURE

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Overview
The DXC-C P4 Secure is a fixed flat roof window for flat roofs (suitable for pitches 0°–15°). It provides natural daylight where vertical glazing is impractical and is certified to resistance class RC2 (EN 1627) for enhanced burglary protection. Thermal and acoustic performance make it suitable for commercial and residential roof applications.

Key features

• Fixed, non-opening structure
• Anti-burglary class RC2 (EN 1627)
• Installation pitch: 0°–15°
• Window Uw: 1.2 W/m²K
• Acoustic insulation Rw: 35 dB

Dome (external cover)
Transparent multi-layer polycarbonate dome with double-sided UV protection coatings. Factory-fitted dome offers high impact and weather resistance while minimising weight and roof load. Ensures optimal daylight transmission and contributes to window tightness.

Glazing unit
Single-chamber P4 glazing unit with toughened outer glass and internal P4A laminated inner pane. Cavity filled with argon to support thermal performance. Reported Ug values ≈ 1.0–1.1 W/m²K; overall window Uw 1.2 W/m²K. Internal laminated glass provides resistance consistent with RC2 classification.

Thermal and acoustic performance

• Glazing unit Ug (reported): ~1.0 W/m²K (configuration dependent, sometimes referenced as 1.1 W/m²K)
• Total window thermal transmittance Uw: 1.2 W/m²K
• Acoustic insulation: Rw = 35 dB

Design, materials and appearance
Frame: multi-chamber uPVC profile in white. Dome: transparent multi-layer polycarbonate with UV protection. Glazing: toughened outer pane + P4A laminated inner pane (4H‑14‑33.4T) with argon fill.

Installation and compatibility
Designed for flat roof installation (0°–15°). Can be raised on approved installation bases (e.g., XRD or XRD/W) for specific mounting conditions such as green roofs. Compatible with external and internal accessories (sun protection, blinds) for customisation.

Safety and usage
Classified SECURE (anti-burglary RC2). Watertightness declared compliant. Not a walk-on window. No electric control, solar supply or remote control installed as standard for this fixed product.

Technical specifications

• Commercial size (W × H): 60 x 60 cm
• External frame width: 820 mm
• External frame height: 820 mm
• Window frame clear opening width: 517 mm
• Window frame clear opening height: 517 mm
• Window sash clear opening width: 476 mm
• Window sash clear opening height: 476 mm
• Window reveal clear opening width: 558 mm
• Window reveal clear opening height: 558 mm
• External frame material: multi-chamber uPVC profile (white)
• Glazing unit: single-chamber P4 unit (4H – 14 – 33.4T) with argon fill and internal P4A laminated glass
• Glazing unit Ug: ~1.0 W/m²K (also referenced as 1.1 W/m²K depending on configuration)
• Total window thermal transmittance Uw: 1.2 W/m²K
• Number of seals: 2
• Airtightness (air permeability): Class A3
• Acoustic insulation Rw: 35 dB
• Safety level: SECURE (anti-burglary class RC2 per EN 1627)
• Watertightness: Compliant
• Walk-on window: No
• Control system: Non-opening
• Solar power supply: No
• Installed electric control: No
• Remote control: No
• Roof pitch for installation: 0°–15°
• Product weight: 35.5 kg
• Package width: 0.91 m
• Package length: 0.92 m
• Package height: 0.38 m