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Air ducts
Certification manual
Certification Manual
Technical Certification Rules

Scope of the programme

The programme scope covers rigid and semi-rigid ventilation ductwork systems divided into the following sub-programmes:

Each sub-programme applies to ductwork systems fitted with integrated sealing solution as described in relevant Rating Standard.

All ranges of products that fall into the relevant sub-programme scope and are promoted by the Applicant/Participant shall be certified. The “certify-all” principle applies not only to Europe but to all markets.

The DUCT programme does not cover other types of ventilation ductwork elements like flexible ducts, double-wall ductwork or ductwork made of insulation ductboards.


Air leakage limit
The air leakage limit (fmax) is the maximum permitted leakage factor for the ductwork according to its air tightness class defined as per the ductwork classification.

Air tightness class
The air tightness classes A to D are defined as per the ductwork classification that appear in standards: EN 12237:2003 and EN 1507:2006.

Design operating pressure
Maximum static pressure difference pdesign (Pa) for which the installed ductwork is designed to operate under normal conditions.

Ductwork system
The ductwork system refers to the assembly of the ducts and fittings of an HVAC (Heating, Ventilation and Air-Conditioning) installation that are used to supply the air to or extract the air from the conditioned spaces.

It does not include components such as air handlers, heat recovery units, air terminal devices, coils.

Integrated/additional sealing solution
In the present document a sealing solution is referred to as “integrated” when it is supplied in each delivery as an integral part of the sealing solution or factory installed.  
On the contrary, a sealing solution is said “additional” when applied on the construction/application/installation site.
See relevant Rating Standard for detailed list of integrated/additional sealing solutions.

Minimum and maximum service temperatures
Respectively lowest and highest temperature at which the ducts and fittings, when installed, continue to function within specified limits of performance.

Refer to relevant Rating Standard.

Resistance to external pressure
The resistance to external pressure value is given as the force F that is the maximum allowed force received to reach a duct height deformation of 3 mm. The value shall be rounded down to the nearest ten.

Rigid/semi-rigid/flexible ductwork
The definitions for rigid/semi-rigid and flexible ductwork that are stated in standard EN 12792:2003 apply.

Static gauge pressure limit
Maximum design operating pressure ps (Pa) for the ductwork according to its air tightness class.

Typical ductwork system
When a ductwork system is set up in compliance with the requirements specified in the relevant Rating Standard it is then considered representative of the range to be certified and referred to as “typical ductwork system”.

Certified performance items and associated tolerances

When tested by the independent laboratory personnel, the obtained results shall not differ from the claimed values. The tolerances with respect to the declared ratings are the following:

Air tightness class (all): as claimed or better
Positive and negative pressure limits (all): as claimed (no tolerance)
Dimensions (DUCT-MC): as per EN 1506:2007
Dimensions (DUCT-MR): as per EN 1505:1998
Maximum service temperature (DUCT-P): as claimed (no tolerance)
Minimum service temperature (DUCT-P): as claimed (no tolerance)
Resistance to external pressure (DUCT-P): ±10%