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Nature of excellence for Air Handling Unit
Certification manual
Statement of Principle
Certification Document

Scope of the programme

This certification scheme covers Air Handling Units (AHU), as stated in the Statement of Principle section I only product with a valid ECP certificate can be NEx certified, therefore the scope of the AHU programme stated in the OM-5 AHU (last version in force) applies for this certification scheme.


Air Handling Unit: A factory made encased assembly or flat-packaged unit that consists of a fan or fans and other necessary equipment to perform one or more of the following functions: circulating, filtration, heating, cooling, heat recovery, humidifying, dehumidifying and mixing of air. The unit should be suitable to be used with ductwork.

Model Box: Construction envelope built according to specifications presented in manufacturer’s literature, used to establish mechanical, thermal and acoustical performance according to the relevant EN standards.

Real Unit: Unit from the range of a specific size, used to establish complete performance for all the available functions of the Air Handing Unit range, according to the relevant EN standards.

Thermal transmittance [W.m-2.K-1]: The heat flow per area and temperature difference through the casing of the air handling unit.

Filter bypass leakage [%]: Air bypass around filter cells as a percentage of rated air volume flow.

Acoustical insulation [dB]: Sound insertion loss value of the Air Handling Unit.

Certification requirements

The follwoing requirement categories are included in this programme:

  1. Service
    1. Products and components warranty
    2. After sale service
    3. BIM file
    4. Delivery time
  2. Products
    1. Inherent availability
    2. Durability
    3. Recyclability
    4. Transport, assembling and dismantling
    5. Start-up, regular and long term maintenance feature
    6. Minimum performances
    7. Controls
    8. Production
  3. Components
    1. Certification
    2. Durability
    3. Energy efficiency
    4. Minimum performances
  4. Quality management
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