www.etsnord.fi
20
RDT-07-0121
®
NORD
fire
|
FDMB
Fig. 28 Built in edge
“Wall edge sticker” indicates the recommended edge of installation of fire damper into the fire
partition structure (wall). The damper must be installed so that the entire damper blade - in the
closed position - is located inside the fire separating structure (wall) and at the same time the
control mechanism and inspection openings are freely accessible.
4.2 The control mechanism has to be protected (covered) against damage and pollution during
installation process. All fire dampers has to be closed during installation process. The damper
body should not be deformed in the course of bricking in. Once the damper is built in, its blade
should not grind on the damper body during opening or closing.
Fig. 29 Installation opening
4.3 Examples of fire damper installing
The fire damper can be integrated into a solid wall construction made e.g. of normal concrete/
masonry, porous concrete with minimum thickness 100 mm or into solid ceiling construction made
e.g. of normal concrete with minimum thickness 110 mm or porous concrete with minimum
thickness 125 mm.
The fire damper can be integrated into a gypsum wall construction with fire classification EI 120
or EI 90.
The fire damper can also be integrated outside the wall construction. Duct and the damper part
between the wall construction and the damper blade (labelled with BUILD IN EDGE on the
protective covering) must be protected with fire-fighting insulation.
If is damper installed outside a construction it is necessary to use reinforcement VRM.
1- * The recommended dimension of the installation opening is from 25 mm to
2- 50 mm on the both sides (it means from A+50 to A+100 or B+50 to B+100)
