VELUX roof windows

GNL 64

VELUX bottom-operated, top-hung roof window

GNL 1064
(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.

Enjoy panoramic views of the outdoors and a feeling of extra space with the VELUX bottom-operated, top-hung roof window GNL. Open the window outwards by using the handle at the bottom to allow for an uninterrupted contact to the outside.

The window can be installed in roof pitches between 15° and 75° to the horizontal. From 55° to 75°, use special springs. If special springs are to be fitted, the replacement should be carried out by a VELUX service engineer. Note: 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
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
SK08	1140	1398	1.16	1.25

Voce di capitolato

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