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Verfügbare Sprachen
Verfügbare Sprachen
7
Calculation of force to open and close
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 and top hung windows only.
Note!
The maximum rated drive force is to be taken from the technical data you
will find in chapter „5 Technical data for 1 motor" on page 25.
º
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 light domes or horizontally installed windows
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 the sash weight Fg and the wind load F
10.2013 | G28064 | Printed in Germany
Wind load in dependence 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
w
27
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