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Certification manual
Certification Manual
OM (Operational Manual)
RS (Rating Standard)

Scope of the programme

The Eurovent Certified Performance (ECP) programme scope for Fans (FANS), applies to all fan types that are intended to be used as Air Handling Unit (AHU) components. The programme is divided into two sub-programmes. The first (FAN-C) applies to the complete assembly as provided by the fan manufacturer, and integrated in an AHU that is composed of at least the following:

  • Support structure
  • Impeller
  • Electrical motor
  • Housing (whenever applicable).

The second (FAN-I) applies to the following basic assembly:

  • Impeller
  • Housing (whenever applicable).

The certification programme uses the “wire-to-air” approach, as described in the Rating Standard. The wire-to-air approach consists in assessing the fan performance from the electric wire to the air discharge, accounting for all the components involved in the air stream generation, which affect the performance data. Therefore, in both sub programmes, certain additional product catalogue items will also need to be included in the certification process. These items are described in the Operation Manual. 

Product type

Fans for use in AHUs are designed to distribute air across the AHU components and the building. ISO 13349:2010 describes fans as a rotary-bladed machine that receives mechanical energy and utilises it by means of one or more impellers, fitted with blades, to maintain a continuous flow of air or other gas passing through it. 

The majority of fans used in AHUs are centrifugal fans. 

  • In centrifugal fans the air enters the impeller(s) with an essentially axial direction, and leaves it in a direction perpendicular to that axis. The impeller may have one or two inlets, and may or may not have a housing
  • Blade types include backward-curved, backward-inclined, aerofoil, forward curved and radial-bladed, including radial-tipped and radial shrouded configurations
  • For centrifugal fans the fan flow angle, i.e. the angle between incoming and outgoing gas flow directions, is higher than or equal to 70°
  • When fitted with a housing the fan is called a “housed centrifugal fan”. The housing is generally a scroll type casing (shroud) that includes supports for either Belt or Direct Drive
  • When the centrifugal fan is unhoused it is called “plenum fan”
  • Plug fans are a centrifugal fan that have an unhoused impeller arranged such that the system into which it is inserted acts as a housing, allowing air to be drawn into the impeller inlet. 

Axial fans are another fan type, though their use in AHUs and inclusion in the Programme is far less common.

  • Axial fans propel gas in the direction axial to the rotational axis of one or more impeller(s), with a swirling tangential motion created by the rotating impeller(s)
  • Blade types include vane axial and tube axial
  • The axial fan may or may not be equipped with a cylindrical housing, inlet or outlet guide vanes or an orifice panel or orifice ring
  • For axial fans the fan flow angle, i.e. the angle between incoming and outgoing gas flow directions, is lower than or equal to 20°.


While exploring our certified products you’ll come across a number of technical terms relating to certification. The below definitions help explain the search criteria in our certified product directory.

Certified product types in the FANS programme have the following search criteria in common. 

Brand name of the manufacturer.

Listing of models with some common features.

Model name.

Fan type
Is the type of fan e.g. axial, centrifugal, unhoused, plug, plenum etc. 

Is a ‘with’ or ‘without’ result to indicate if the fan includes a housing (casing).

Motor technology
Is the motor technology e.g. EC (Electronically Commutated) AC (Alternating Current) or PM (Permanent Magnet).

Motor IE class
Is the motor efficiency class, rated as E2, E3 or E4. E2 is the lowest (standard) efficiency, while E4 is the highest efficiency rating.

Drive arrangement
Is the drive arrangement. Options include direct drive, V-belt transmission, flat bed transmission, cog belt transmission and coupling.

Controller type
Is the controller type e.g. multi-speed or variable speed.

Motor nominal power
Is the nominal power of the motor. Measured in W.

Poles number
Is the number of permanent magnetic poles in the motor.

Type of current
Is the type of current for motor execution. Options include single phase or three phase.

Impeller diameter
Is the impeller nominal tip diameter. Measured in mm.

Impeller arrangement
Is the impeller arrangement. It indicates if the impeller is fed through one inlet (single inlet) or two inlets (double inlet). 

Blade type 
Is the type of blade used by the fan. Options include Aerofoil, backward-curved, forward-curved, backward-inclined, radial-bladed, radial-tipped, radial shrouded, vane axial or tube axial.

Inlet ancillary
Is the inlet ancillary type e.g. cone, nozzle, ring etc.

Supply voltage
Is the supply voltage. Measured in V. 

Supply frequency
Is the supply frequency, measured in 50Hz or 60Hz.

Nominal Volume Flow 
Is the reference flow rate for data display. Expressed in m3/h.

Nominal speed
Is the nominal rotational speed of the fan. Measured in rpm.

Maximum speed
Is the maximum rotational speed of the fan, for which there is no risk of blade damage. Measured in rpm.

Factory country
Country of manufacture.

Factory city
City of manufacture.

Software version
Version number of the software selection tool.

Software name
Name of the software selection tool.

Search for certified products in our Fans programme via our certified product directory

Certified performance items and associated tolerances

When tested in the laboratory the obtained performance data shall not differ from the declared values by more than the following tolerance values:

Static pressure difference -4 % or -15 Pa
Shaft power, including bearings +3 %
Impeller efficiency -5 percentage points
Maximum fan speed -5 %
Motor (electrical) input power +3 %
Drive/control (electrical) input power +3 %
Overall (static) efficiency   -5 percentage points
Inlet/outlet LWfc by octave bands at 125 Hz +5 dB
Inlet/outlet LWfc by octave bands for 250 Hz - 8000 Hz +3 dB

Search for certified products in our Fans programme via our certified product directory

Find out how to apply for the Fans programme

💡 Good to know

When using the Advanced Search Criteria function you can search via impeller diameter and nominal volume flow.
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