Application description:


With the update on the new regulations that affect the manufacture and assembly of ducts, compliance is increasingly being required and therefore the airtightness for the energy savings verification tests in the finished facilities are being carried out more normally.

Given that it is very difficult to assess in advance the level of tightness of a recently assembled installation, based on the multiple experiences acquired in our assistance on works at the request of our clients to carry out tests, we have been able to develop a tool that undoubtedly It will be very useful to be able to carry out this prior evaluation of the state of the tightness of an installation in accordance with the EN-1507:2006 standard and its calculation formula:

 f = c · p0,65

in which:

  • f    representa las fugas de aire en l/seg por m²
  • p   es la presión estática en Pa
  • c    es un coeficiente que define la clase de estanqueidad

It is a KIT of components that we can supply so that the same personnel of the installation company can carry out the final verifications of the installation of a duct and be able to seal or repair the leaks before the access conditions become complicated and thus be able to comply with the required airtightness class, avoiding final surprises that normally have a difficult solution. The ducts thus prepared will have full guarantees of success so that later, in our final assistance, we obtain the favorable values ​​that will appear in our official test report.

This verification method is very simple:

It is achieved through the use of a high pressure single-phase centrifugal fan, with exclusive characteristics for RAMI-SYSTEM®, which blows air through a section of flexible duct in the branch of the duct to be tested, a digital pressure gauge and its various components of connection.

The performance of each fan has been previously analyzed in our test bench with respect to a calibrated standard, which determines that, individually and identified with its serial number, a table of correction coefficients at different pressure levels is attached to ensure maximum reliability in its use.

To carry out the test, the duct section is previously plugged at its ends and the fan drive is connected to the pressure gauge. When it stabilizes, its value in kPa is entered in our online application “DUCT LEAKAGE LIMIT CALCULATOR“, together with the selection of the desired sealing CLASS:  A , B , C  or  D and finally the total surface area in of the duct being tested.

After pressing the “CALCULATE” box, in the lower part we obtain the result in percentage on a green background if we are below the acceptable leakage limit value or another percentage on a red background if it exceeds that limit value.

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You can check the level of airtightness of a duct in a very simple way by clicking on the following link: