8
RDT-43-0921
®
NORD
fire
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FDMA-PM
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3.3 Blades overlaps
Tab 3.3.1.
Blades overlaps
Blades overlaps
Dimension
Overlaps
DAMPERS SPIRO
Fig.26
Act. mechanism side
"g"
Tab. 4.2.1
Side without act.mechanism
"h"
DAMPERS WITH FLANGES
Fig.27
Act. mechanism side
"e"
Tab. 4.2.2
Side without act. mechanism
"f"
These values has to be respected when projecting related air-conditioning ducts.
Fig. 12 Blades overlaps SPIRO
4. Placement and Assembly
4.1 The fire dampers are suitable for installation in arbitrary position in vertical and horizontal passages
of fire separating structures. The damper assembly procedures must be done so that all load transfer
from the fire separating constructions to the damper body is absolutely excluded. The back-to-back
air-conditioning piping must be suspended or supported so that all load transfer from the back-toback
piping to the damper flanges is absolutely excluded. The gap between the installed damper and
the building structure must be perfectly filled with approved material all over its volume.
To provide the necessary space for access to the control device, all other items must be situated at
least 350 mm from the control parts of the damper. At least one inspection hole must be accessible.
The damper must be installed so that the damper blade (in closed position) is situated in the fire
separating structure - marked by the label BUILD-IN EDGE on the damper body. If such solution is
not possible, the piping between the fire separating structure and the damper blade must be
protected according to the certified installation method, see Section 6.
During the installation and plastering process, the control mechanism must be protected (covered)
against damage and pollution. The damper body should not be deformed during bricking in. Once
the damper is built in, the damper blade should not grind on the damper body during opening or
closing.
The distance between the fire damper and the structure (wall, ceiling) must be 75 mm at the minimum. If
two or more dampers are to be installed in one fire separating structure, the distance between adjacent
dampers must be 200 mm at the minimum, according to EN 1366-2 paragraph 13.5. For admissible
exceptions see Section 6
