Calculating The Opening And Closing Force - G-U ELTRAL KS 30/40 EASY TR Montage- Und Bedienungsanleitung

Assembly and operating instructions
ELTRAL KS 30/40 EASY TR
Chain drive
7

Calculating the opening and closing force

Note! With the formulae indicated below it is possible to determine the approxi-
mate force required to open or close a (smooth-running) window.
º
Possible snow loads are to be considered.
The application formula considers tilt windows, top hung windows, and
roof-lights only.
Note!
The maximum rated drive force is to be taken from the technical data you
º will find in chapter „5 Technical data for 1 motor" on page 19.
If the values you calculated exceed the max. allowed force, please contact
Gretsch-Unitas GmbH Baubeschläge.
F, F , F = opening / closing force (N)
g K
P = sash weight (kg)
A = window area (m²)
H = sash high (mm)
C = opening distance of sash (mm)
F = wind load
W
For roof-lights and small domes
Calculating the drive force depending on the sash weight P
For vertically installed tilt or top hung windows
Calculating the drive force depending on the sash weight P
Calculating the drive force depending on the wind load F
Calculating the drive force depending on sash weight and wind load
22
Wind loads depending on the
building height
height
0 - 8 m
8 - 20 m
20 - 100 m
> 100 m
F = 5.4 x P
g
F = 5.4 x P x C / H
g
W
F = F x A / 2
K W
F= F + F
g K
F
w
500 N/m²
800 N/m²
1100 N/m²
1300 N/m²