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Gypsum blocks light walls
Gypsum blocks wall can be built with special solid gypsum blocks
with interlocking shaped edges as indicated in the supplier's instruc-
tions and according to the following characteristics:
• minimum thickness 70 or 100 mm according to the type and re-
sistance class required;
• minimum density 995 kg/m³.
It is generally advisable to first build the wall and then provide the
opening for the fire damper.
EI 120 S Installation within vertical rigid wall
The WKS25 fire dampers classified EI 120 S within vertical rigid walls,
guarantee fire and heat sealing for 120 minutes only if installed inside
walls with a minimum fire resistance class of REI 120, minimum thick-
ness of 100 mm and minimum density of 550 kg/m³.
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.
WKS25 series fire dampers can therefore also be installed within walls
made of brick or concrete with a minimum thickness of 100 mm.
Comply with the minimum distances indicated on section Minimum
distances
Single fire damper wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the fire damper. It is advisable
not to exceed by more than 10 mm from the indicated sizes so as not
to compromise the correct thermal insulation.
The use of a reinforcing beam above the opening is recommended
for walls made from concrete blocks, bricks or in concrete cell ele-
ments.
For walls built with perforated elements, it is also recommended that
the area of the opening be made from full elements (for example
aerated concrete blocks) to guarantee the correct adhesion of the
mortar.
Paired fire dampers wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the paired fire dampers:
– Vertically paired fire dampers
base = damper base + 50 mm
height = h h 45 mm + 50 mm
– Side by side paired fire dampers
base = base1 + base2 + 45 mm + 50 mm
height = damper 50 mm.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
The use of a reinforcing beam above the opening is recommended
for walls made from concrete blocks, bricks or in concrete cell ele-
ments.
Damper positioning
Lift the fixing flaps located on the fire damper casing. See section
Fixing flaps for further details.
Position the damper in the opening so that the side of the closing
mechanism extends from the wall by 185 mm.
Be careful not to damage the intumescent gasket on the outside the
casing.
Secure the fire damper to the wall using four screws on the four holes
of the fixing flaps.
The double test (with the mechanism inside and outside the fire
area) demonstrated that there is no preferred direction for the po-
sition of the damper, both in relation to air flow and the side with
the higher probability of exposure to fire, as indicated in standard
EN1366-2 (paragraph 6.2).
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 12,5 mm, to make a frame 100 mm wide.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Plasterboard infill panel, thickness 12,5 mm
EI 120 S Installation in vertical rigid wall - Special cases
Installation in contact with ceiling or floor or side wall
Opening dimensions are as indicated in the previous section.
Apply only three plasterboard layers "U" shaped along the three free
sides of damper.
This installation is allowed for two fire dampers paired in battery as
well.
Corner room installation
Opening dimensions are as indicated in the previous section.
Apply two plasterboard layers, to compose a “L” shape on the two
free sides of the fre damper.
This installation is allowed for two fire dampers paired in battery as
well.
In case of two side by side paired fre dampers it is necessary to
position the fre dampers with vertical axis, due to the mechanism
presence.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Ceiling contact installation
2. Corner room installation
3. Installation wall
4. Ceiling or floor
5. Side vertical wall
6. Plasterboard infill panel, thickness 12,5 mm
EI 120 S Installation within vertical light wall (plasterboard)
The WKS25 fire dampers classified EI 120 S within light (plasterboard)
walls guarantee fire and heat sealing for 120 minutes only if installed
inside walls with a minimum fire resistance class of EI 120 and mini-
mum thickness of 100 mm.
Laboratory test were carried out using 100 mm thick wall with two
plasterboard layers 12,5 mm thick for side and insulated with rock
wool 100 kg/m³ density (optional).
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.
