How and where to use guide
VELUX Centre-Pivot Roof Windows White Painted 55x98cm GGL CK04 2070
Typical applications and positioning
The GGL CK04 is ideal for loft rooms, attic conversions and any pitched roof installation where you want to maximise usable floor space. The centre-pivot design means you can position the window lower than traditional top-hung alternatives, giving excellent sightlines whether standing or seated. This makes it particularly suitable for bedrooms, home offices and living spaces in converted roof voids. The 55x98cm size (CK04) suits standard rafter spacings and fits between typical roof timbers without extensive structural modification.
- Install in pitched roofs between 15 and 55 degrees pitch
- Position lower than conventional windows for better views from seated positions
- Suitable for loft conversions, attic bedrooms and roof-level living spaces
- Works well in rooms where furniture placement beneath the window is necessary
Safe operation and ventilation
Operation is straightforward via the top control bar. For fresh air without fully opening the window, simply open the top control bar to the ventilation position, which allows air circulation whilst maintaining security and weather protection. The removable and cleanable ventilation filter protects against dust and insects during this mode. For full opening, the centre-pivot mechanism allows the window to rotate 180 degrees, making it simple to operate even when furniture is positioned directly underneath. The toughened glass and safety lamination are standard, providing impact resistance and security.
- Use the top control bar ventilation position for fresh air without full opening
- Clean or replace the ventilation filter regularly to maintain airflow and protect against dust and insects
- Rotate the window 180 degrees for safe external glass cleaning from inside
- The centre-pivot design allows full operation without moving furniture
Glazing performance and weather protection
The window comes with premium glazing as standard, including toughened glass for impact resistance, safety lamination for security, and a UV filter to protect furnishings from sun damage. VELUX's unique rain noise reduction technology minimises sound from heavy rainfall, important in exposed roof positions. The glazing specification means no upgrades are necessary for most residential applications, though you should verify compliance with Building Regulations for your specific installation.
- Safety lamination and toughened glass are fitted as standard
- UV filter protects interior furnishings and fittings from sun damage
- Rain noise reduction technology minimises weather noise in exposed positions
- Verify glazing specification meets current Building Regulations for your application
Maintenance and accessories
Maintenance is minimal. The removable ventilation filter should be checked regularly and cleaned or replaced as needed, particularly if the room is dusty or in a high-pollen area. External glass cleaning is safe and convenient thanks to the 180-degree rotation. Blinds and other accessories can be quickly fitted using the pre-fitted brackets, allowing you to add blackout or thermal control without additional fixings. Check the frame and seals annually, particularly after severe weather, and ensure the control bar mechanism operates smoothly.
- Check and clean the ventilation filter regularly, especially in dusty environments
- Use the 180-degree rotation for safe external glass cleaning from indoors
- Blinds and accessories click directly into pre-fitted brackets for quick installation
- Inspect frame seals and control bar mechanism annually for smooth operation