VELUX roof windows

GLL 6421

VELUX electric, centre-pivot roof window

GLL 106421
(interior finish - wood, clear lacquer; exterior cover - aluminum dark gray)

IMPORTANT NOTE: This product is subject to regional limitations, please check availability on the "regions" tab.

The VELUX electric, centre-pivot roof window GLL adds comfort and convenience to your daily life. The built-in rain sensor ensures total peace of mind by automatically closing your roof windows at the first sign of rain. The window is a wired solution that operates remotely using a basic wall switch - perfect for both in-reach and out-of-reach installations.

The window can be installed in roof pitches between 15° and 90° to the horizontal.
Note: When the window is used manually, a combination of roof pitches, window sizes, cover materials and accessories might hinder parking of the sash in some open positions.

Window Code	Width in mm	Height in mm	Effective Daylight Area in m2	Geometric Free Area in m2
CK02	550	778	0.22	0.26
FK06	660	1178	0.47	0.54
MK04	780	978	0.47	0.53
MK06	780	1178	0.59	0.66
MK08	780	1398	0.72	0.81
MK10	780	1600	0.85	0.94
PK08	942	1398	0.92	1.01

Specification

Performance window characteristics	Performance
Thermal transmittance (U-value)	1.0 W/(m²K)

Light transmittance (τ,v)	0.63

Total solar energy transmittance (g-value)	0.45

Sound insulation (Rw)	35(-1;-3) dB

Air permeability, [class]	4

External fire performance - British [class]	AC

External fire performance - European [class	npd

Impact resistance [class]	3

Load-bearing capacity of safety devices	✓

Reaction to fire [class]	C-s1,d0

Resistance to snow load	See glazing composition

Resistance to wind load [class]	C3 (>SK08: NPD)

Water tightness [class]	E900





Glazing unit	Composition (from inside to outside)
Triple-glazed	6 mm float glass - 13 mm Argon - 3 mm heat strengthened glass - 13 mm Argon - 4 mm toughened glass