VELUX roof windows

GLL 85B

VELUX bottom-operated, centre-pivot roof window

GLL 1085B

(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 bottom-operated, centre-pivot roof window GLL 1085B offers a combination of high thermal efficiency and excellent sound insulation. Bottom operation makes it easy to operate the window when installed in a higher position, for example due to a high knee-wall.

The window can be installed in roof pitches between 15° and 90° to the horizontal. 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

Due to the extra sound reduction feature, background ventilation is not possible.

规格

Performance window characteristics	Performance
Thermal transmittance (U-value)	0.90 W/(m²K)

Light transmittance (τ,v)	0.63

Total solar energy transmittance (g-value)	0.45

Sound insulation (Rw)	38(-1;-3) dB

Air permeability, [class]	4

External fire performance - British [class]	AA

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]	9A





Glazing unit	Composition (from inside to outside)
Triple-glazed	8 mm float glass - 11.5 mm krypton - 3 mm heat strengthened glass - 11.5 mm krypton - 6 mm toughened glass

技术规格

唯一参考GLL-85B
产品系列Center Pivot
产品组Manual bottom operated
类型对象（单个对象）
发布日期2026-02-01
版本号1

链接

技术说明https://contenthub.velux.com/api/public/content/56039-c5ad7-47492_downloadOriginal?v=7b8f4c8c

欧洲	亚洲
乌克兰	土耳其
保加利亚
克罗地亚
匈牙利
塞尔维亚
拉脱维亚
捷克共和国
斯洛伐克
斯洛文尼亚
波兰
波斯尼亚黑塞哥维那
爱沙尼亚
立陶宛
罗马尼亚