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Scope of the programme

Eurovent Air to Air Rotary Heat Exchangers Certification Programme applies to all Rotary Heat Exchangers including casing.
Participants shall certify all models, if available, including:

• all classes:
    condensation rotor / non hygroscopic
    rotor enthalpy rotor / hygroscopic rotor
    sorption rotor
• all rotor geometry (wave height, foil thickness)
• all sizes (rotor diameters and rotor depths)
• all materials
• all airflow rates
• all different types of sealing (if available)

The class “sorption rotor” has to fulfill specific additional requirements on the latent efficiency (see the section "Certified Characteristics”)


2.1 Rotary Heat Exchanger :

A Rotary Heat Exchanger is a device incorporating a rotating cylinder or wheel for the purpose of transferring energy (sensible or total) from one air stream to the other. It incorporates heat transfer material, a drive mechanism, a casing or frame, and includes any seals which are provided to retard the bypassing and leakage of air from one air stream to the other.

2.2 Product Range

The Certification Programme applies to the Rotary Heat Exchanger classes “Condensation Rotor/non hygroscopic rotor”, “Enthalpy Rotor/hygroscopic rotor” and “Sorption Rotor”.

2.3 Pressure drop

Loss in total pressure between the inlet and the outlet of the unit within one air stream.

Testing requirements

Test standards

Performance ratings claimed by manufacturers shall be verified by tests performed in one of independent laboratory selected by ECC.

The following standards shall be used as a basis for these tests:

EN 308 (January 1997): Heat exchangers - Test procedures for establishing performance of air to air and flue gases heat recovery devices

AHRI Standard 1060 (2011): Rating air-to-air heat exchangers for energy recovery ventilation equipment.

Test specifications

 Table 1: Testing conditions for sensible and latent efficiency and pressure drop

*) The Condensation rotors shall be tested only under the Heating condition.

"Regular" test conditions







Entering Supply Airflow


2° C

35° C

- 3° C

35° C

Relative humidity




14.0 g/kg

22.0 g/kg

Entering Exhaust Airflow


22° C

25° C

22° C

25° C

Relative humidity



11.0 g/kg


Leaving Supply Airflow

Face air velocity

1.5 m/s, 2.5 m/s, 4.0 m/s (3.5 if 4 is not applicable)

2.5 m/s

Entering Exhaust Airflow

Face air velocity

Same rate as ‘Leaving supply airflow'

(Mass Flow Ration of 1.0)

Pressure Difference

‘Leaving supply airflow static pressure' minus ‘Entering exhaust airflow static pressure'

0 Pa ... 20 Pa

Rotor speed


Specified by the manufacturer


The following particular specifications shall be applied during the test in the independent laboratory selected by ECC:

  • For Condensation rotors, temperature efficiency, humidity efficiency and pressure drop shall be measured under the above three "regular" Cooling and one "additional" conditions (see Table 1).
  • For Enthalpy and Sorption rotors, temperature efficiency, humidity efficiency and pressure drop shall be measured under the above six "regular and three "additional" conditions (see Table 1).
  • All ratings shall be performed at the rotor speed specified by the manufacturer. If an adjustable purge/cleaning sector is provided, it shall be set to the manufacturer's specified purge angle or setting. All ratings shall be performed at the same rotor speed and purge setting.
  • The pressure drop has to be established in all tests in both air flows, for each test the average of the two measured values has to be compared with the average of the two rated values. This is to eliminate asymmetries due to the arrangement of sealing or of the purge system.
Certified characteristics

The following performance items shall be certified.

  • Under standard conditions (20°C, 50% rel. Humidity and 1.013105Pa - or 1.20 kg/m3)


-  Pressure drop

  • Under "regular" winter conditions for all rotors

Temperature efficiency

Humidity efficiency

  • Under "regular" summer conditions for Enthlapy and Sorption rotors

Temperature efficiency

Humidity efficiency

Published data

Published data correspond to following conditions :

- Rotor diameters are real outside diameters

- Air velocities are calculated according to the free face area of the rotor (inside seals and without hub) and according to a density of 1,2 kg/m3

- The nominal air flow is calculated according to the above defined velocity and a density of 1,2 kg/m³

- Pressure drop is according to a density of 1,2 kg/m³
Reference documents


RS 8/C/002-2018