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3.. Formu
ulas and
d recom
mmenda
ations fo
or installation
3.1.
Calcula
ation of opening
g / closu
ure force
e
Us
sing the fformulas on this page,
p
app
proximate
e calculattions can be made
e for the force
f
re
equired to
o open orr close th
he window
w consid
dering all the facto
ors that determine
d
e the
ca
alculation
n.
Symbols
S
u
used for th
he calculattion
F (kg) = Fo
orce for op
pening or closing
C (cm) = O
Opening stroke (actuator stro
oke)
For ho
orizontal light dom
mes or
skyliights
P (kg)
(
= Weeight of the w
window (mobile sash onnly)
H (cm)
(
= He
eight of the
e mobile sash
s
For verticall windows
s
 TOP
T HUNG WINDOWS
W
, OUUTWARD OPENING (A)
 BOTTOM
B
HUNG WIND
DOWS (B)
F = 0,54 x P
F = 0,54 x P x C : H
(Eventual
(
weight of snow or wind
w
on the
e
cupola
c
sho
ould be callculated se
eparately).
(Even
ntual load of
o favourabble or unfavourable wind
w
on the
e sash shou
uld be calcuulated sepa
arately.)
3.2.
Maximu
um open
ning bas
sed on sash
s
height
Th
he selection of the
e actuator stroke sshould be
e made based
b
on the heigh
ht of the sash
an
nd its app
plication. As a gen
neral rule, never select a sttroke gre
eater than
n the heig
ght of
the window
w frame; select
s
the
e stroke d
directly below it.
WARNING. The actuator is d
designed
d to be re
ecess mo
ounted on
n the window
fr
frame.
C
Check tha
at during
g the stro
oke the chain
c
doe
es not tou
uch the profile
p
off the
ssash, therre are no
o obstaclles to opening the
e window
w and the
e chain does
d
n
not push against
a
th
he windo w frame.
BA
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