Fixing and buying guide
VELUX Centre-Pivot Roof Windows White Painted 78x98cm GGL MK04 2070
Who this window suits and key features
The GGL MK04 is ideal for loft conversions, attic rooms, and any space where you want to maximise usable floor area. The centre-pivot design with top control operation means you can install it lower than traditional windows for better views, and furniture placement is never restricted. Standard glazing includes safety lamination, toughened glass, UV filter, and rain noise reduction technology, so you get premium performance without additional upgrades.
- Top-operated centre-pivot mechanism for easy, one-handed control
- 180-degree rotation for safe internal cleaning of outer glass
- Ventilation position on top control bar allows fresh air without full opening
- Removable and cleanable ventilation filter included to block dust and insects
- Pre-fitted brackets allow quick blind installation by clicking into place
- White painted finish suits most interior schemes
Size and compatibility
The 78x98cm (MK04) is a standard roof window size compatible with common rafter spacings and roof pitches. Confirm your roof pitch falls within the manufacturer's specification range before ordering, and measure your opening carefully to ensure this size matches your requirements. The white painted finish is factory-applied and ready to install without additional preparation.
- Size: 78cm wide x 98cm tall (MK04 designation)
- Suitable for standard pitched roofs within VELUX specification
- White painted finish – no staining or painting required on delivery
- Centre-pivot design fits standard roof construction methods
What is included and pre-installation checks
Your window arrives complete with the top control bar mechanism, safety glazing, ventilation filter, and pre-fitted blind brackets. Before installation, inspect the frame and glazing for any transport damage, check that your roof opening dimensions match the product specification, and ensure the surrounding roof structure is sound and properly flashed. Have your flashing kit and installation hardware ready – these are typically ordered separately according to your roof type and tile profile.
- Window frame with top control bar and pivot mechanism
- Toughened, laminated glazing with UV filter and rain noise reduction
- Removable ventilation filter ready to install
- Pre-fitted blind brackets for quick accessory attachment
- Inspect glazing and frame on delivery for damage
- Verify roof opening size matches 78x98cm specification
- Confirm roof structure is sound before fitting
- Order flashing kit separately to suit your roof tile type
Operation and maintenance
The top control bar is your main operating point – push it upward to open the window fully, or pull it to the intermediate ventilation position for fresh air without opening the sash. To clean the outer glass safely, rotate the window 180 degrees on its pivot hinges; the sash will swing inward, giving you full access to the exterior surface from inside. The ventilation filter should be removed and cleaned regularly to maintain airflow and keep dust and insects out.
- Top control bar: push up to open fully, pull to ventilation position
- Rotate 180 degrees for safe external glass cleaning from indoors
- Remove and clean ventilation filter regularly for best performance
- Blinds attach by clicking into pre-fitted brackets – no tools needed
- Furniture can be placed directly underneath without affecting operation