Duct Leakage Testing

prova tenuta canali aria - Duct Leakage Testing

The duct leackage testing is the most important acceptance tests for aeraulic systems.
Performed according to the basic technical reference standards for ventilation of buildings, it goes to test the amount of air that is ” lost” from the aeraulic system to a specified pressure.


  1. we collect the data of the plants to be tested
  2. we identify the leakage class required in specifications and contracting
  3. we perform the test
  4. we issue a technical report containing all the information in time and test methods , tools used , tested circuits and reports.


  • closing/partitioning section to try with cover caps
  • positioning the measuring instrument and related probes
  • calculating lateral surface section to test
  • test execution

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The minimum air tightness class is chosen according to the principles described below, however a tighter seal class is applied in cases where the total plant surface is exceptionally large compared to the total flow, where then the pressure difference across the channels is very high or in cases where, for control of the air quality requirements, risk of condensation or other, it as to avoid any type of leakage.

• Class A
Air leaks of ATU and technical rooms with fans must be at least class A. Class A is also applied to the exposed ducts in environments where the same channels provide ventilation and where the pressure difference relative to indoor air is less than 150 Pa.

• Class B
The class B is applied to ducts present in rooms without ventilation, to ducts separated from the environment with panels (eg . In a false ceiling channels), or channels placed in environments in which a ventilation with a prevalence exceeding 150 Pa is supplied. The class B is the minimum for all return ducts in areas subject to excessive pressure, excluding technical areas.

• Class C
The class C is applied depending on each case. For example: if the pressure difference inside the channels is exceptionally high, or if any loss can be dangerous for the quality of indoor air, or for the control of pressure conditions , or the functionality of the system.

• Class D
Class D is applied in particular situations.


UNI EN 14239:2002
Ventilation for buildings – Measurement of the surface of the pipes.

UNI EN 12237:2004
Ventilation for buildings – Networks of ducts – Resistance and tightness of circular sheet metal ducts.

UNI EN 13779:2005
Ventilation for non-residential buildings – Performance requirements for ventilation and air conditioning systems.

EN 1507:2008
Ventilation for buildings – Networks of ducts – Resistance and tightness of rectangular sheet metal ducts.

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