SystemAir A-FDR-3G-OF, Instruction Manual

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FDR-3G…OF

Installation 2 - Dry

Using Mineral Wool and Cover Boards

1. The supporting construction opening must be prepared as depicted. Opening surfaces must be even and cleaned 

off. The flexible wall opening must be reinforced as per the standards for plasterboard walls. The opening 
dimensions are driven by the nominal dimensions of the damper with added clearance. For circular dampers 
prepare the opening of diameter D1.

2. With these dampers it is necessary to install the bendable hangers (2) onto the cover boards using suitable screws 

or screws with wall plug (F1). Therefore, it is necessary to begin by installing the bottom part/parts of the CBR-FD 
or CBS-FD cover boards. Insert the damper from the mechanism side and secure the bendable hangers of the 
damper into the cover plate using suitable screws (F1). Subsequently mount the remaining cover boards from the 
mechanism side.

3. Fill in the area between the wall and the damper with mineral wool (F3) with a density of at least 50 kg/m3 

thoroughly but in such a way that will not deform the damper housing, while paying attention to prevent the 
fouling of the damper’s functional parts, which could limit its correct functionality.

4. Close the gap between the damper and the mounting opening, for a circular damper use CBR-FD cover boards, for a 

rectangular damper use CBS-FD cover boards with screws (F1) through pre-drilled holes.

5. All the gaps between the cover boards, between cover boards and the wall and between cover boards and the fire 

damper need to be filled with fire resistive coating (F4).

6. If needed, uncover and clean the damper after installation.
7. Check the damper’s functionality

Installation - Standard Distances

For Dry installation, the minimum distance from the wall or ceiling to the damper body is 100 mm and for DN>560 the 
distance is 150 mm. For multiple crossings through a fire resistive wall the minimum distance between two damper 
bodies is 200 mm and for DN>560 the minimum distance is 300 mm. This applies for distances between the damper 
and a nearby foreign object crossing the fire resistive wall.

Installation in a Wall thinner than tested

Installation in a thinner wall is allowed under the condition that an additional layer/layers of fire protective board are 
fixed to the surface of the wall in order to achieve the same length of damper penetration seal as was tested. The 
minimum width of added boards around the damper is 200 mm. In addition, the alternative thinner wall should be 
classified in accordance with EN 13501-2:2007 + A1: 2009 for fire resistance required for product application. For a 
protruding wall, the additional layers must be fixed on the steel supporting construction of the wall.

2 Dry

FDR-3G...OF

DN200 ... DN630

EI 60 (v

e

 i ↔ o) S

a)  

b)  

360°

EI 90 (v

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 i ↔ o) S