Fire dampers installed at a minimal distance from another damper or from an adjacent supporting construction

Minimal distance

According to the European test standard, a fire damper must be installed at a minimum distance of 75 mm from an adjacent wall and 200 mm from another damper, unless the solution was tested at a shorter distance.  

The main Rf-t fire dampers have been tested – and may, therefore, be installed – in a vertical or horizontal supporting construction, at a distance below the minimum set by the standard. No less than 90% of the classifications of our fire dampers qualify for this installation method. The minimal distance is reduced to 30 mm for circular dampers and to 50 mm between 2 dampers or between a damper and a vertical wall, and to 25 mm between a damper and a floor/ceiling.
 fig. 1 : principle circular dampers   fig. 2 : principle rectangular dampers

For the Rf-t fire dampers, the solution consists of the following elements: a generic sealing (rigid stone wool panels 150 kg/m³ applied to a depth of 400 mm) at the side with minimal distances and a sealing compliant with existing classifications for the rest of the opening
Watch the short presentation here.
Details for each damper and each wall type are given in the installation instructions on our website and in the technical documentation.

CR60 / CR120 / CR2 / CU-LT / CU2