How and where to use guide

VELUX Centre-Pivot Roof Windows White Painted 78x98cm GGL MK04 2070Q

Typical applications and installation

This roof window is designed for installation in pitched roofs where a top-operated, centre-pivot action is required. It is commonly used in loft conversions, attic bedrooms, home offices, and studio spaces. The 78x98cm size (MK04) is a standard metric dimension suitable for most domestic roof pitches. Installation should be carried out by a qualified installer to ensure proper flashing, weatherproofing, and structural support. The window must be fitted with appropriate roof flashing kits to prevent water ingress and ensure compliance with building regulations.

Loft conversions and attic room conversions
Residential properties requiring enhanced security
Spaces where external window cleaning access is limited or unsafe
Rooms requiring both natural light and controlled ventilation

Operation and ventilation

The top-operated control bar allows intuitive opening and closing of the window. The window can be opened to a ventilation position, which permits fresh air circulation through a partially closed window without fully opening the sash. This is particularly useful for maintaining security whilst allowing air exchange. The centre-pivot design enables the window to rotate 180 degrees, allowing safe cleaning of the external glass from inside the property without requiring external access or scaffolding. The removable and cleanable ventilation filter should be regularly inspected and cleaned to maintain airflow and protect the interior from dust and insects.

Open the top control bar to ventilation position for fresh air without full opening
Rotate the window 180 degrees for safe internal cleaning of external glass
Window operates smoothly even with furniture positioned directly underneath
Clean or replace the ventilation filter regularly to maintain airflow efficiency

Security features and maintenance

This window incorporates multiple security enhancements as standard. Integrated frame locks, extra-strong hinges, laminated internal glazing, and toughened external glazing work together to resist forced entry and accidental breakage. The laminated internal glazing holds together if broken, whilst the toughened external glazing is designed to resist impact. These features require no additional maintenance beyond standard window care. Periodically check that locks operate smoothly and hinges remain tight. Clean glazing with appropriate glass cleaner and soft cloths. Do not attempt to force the window if it becomes stiff; lubricate hinges and locks with silicone-based lubricant if required.

Integrated frame locks and reinforced hinges provide burglary resistance
Laminated internal and toughened external glazing resist breakage and forced entry
Check locks and hinges periodically for smooth operation
Use silicone-based lubricant on hinges and locks if movement becomes stiff
Clean glazing with soft cloths and appropriate glass cleaner only

Thermal performance and blind installation

The 2-layer glazing system reduces heat loss through the window, contributing to improved thermal efficiency in converted roof spaces. This is particularly important in loft conversions where roof insulation and airtightness are critical to building regulation compliance and occupant comfort. The window features pre-fitted brackets that allow blinds to be quickly and easily clicked into place without additional fixings or tools. Blinds can be selected separately to provide light control, privacy, and additional thermal performance if required. Ensure blinds are compatible with the VELUX bracket system before purchase.

2-layer glazing reduces heat loss and improves thermal comfort
Pre-fitted brackets allow quick blind installation by clicking into place
Select blinds separately to suit your light control and privacy requirements
Ensure blind compatibility with VELUX bracket system before ordering