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ATTENTION
With bottom hung windows injury could be caused if the window accidentally falls.
An appropriately sized flexible link arm or fall prevention safety system designed to
resist a force equal to at least three times the total weight of the window
MUST
be
installed.
Danger of crushing or dragging. During function, when the actuator closes the
window, a force of 300N is exerted on the bead of the frame, enough to crush
fingers in the event of distraction.
Ensure that the stroke-end selection is less than one centimetre from
mechanical stop blocks, stroke limiters or any physical obstacles blocking
opening of the sash.
In the event of breakage or malfunction, switch the appliance off at the general
switch and call for the services of a qualified technician.
2. Formulas and recommendations for installation
2.1.
Calculation of opening / closure force
Using the formulas on this page, approximate calculations can be made for the force
required to open or close the window considering all the factors that determine the
calculation.
Symbols used for the calculation
F (Kg) = Force for opening or closing
P (Kg) =
Weight of the window (mobile sash only)
C (cm) = Opening stroke (actuator stroke)
H (cm) = Height of the mobile sash
For horizontal light domes or
skylights
F = 0,54 x P
(Eventual weight of snow or wind on the
cupola should be calculated separately)
.
For vertical windows
TOP HUNG WINDOWS
,
OUTWARD OPENING
(A)
BOTTOM HUNG WINDOWS
(B)
F = 0,54 x P x C : H
(Eventual load of favourable or unfavourable wind
on the sash should be calculated separately.)
