Eurovent Certification sets performance ratings according to European standards for products manufactured in the HVAC sector. This gives the confidence that the product they buy for end users will work in accordance with the stated requirements, and for manufacturers, they are able to compete fairly and constantly develop their products.

References to EN 1886 and EN 13053 standards for performance measurements of Air Handling Units. According to EN 1886 standard, mechanical performance classes of ‘Mechanical Strength Test, Air Leakage Test, Filter Bypass Leakage Test, Heat Conduction Test, Heat Bridging Test, Acoustic Insulation Test on the AHU Model Box are determined. According to EN 13053 standard, ‘Heating-Cooling Capacity-Pressure Loss Test, Air Diffusion Test, Motor Power Test, Pressure Loss Test, Sound Power Test are performed on the Air Handling Unit Real Unit and it is verified by comparing with the selection program of the manufacturing firm. In this view, the technical performance of the product presented to the customer is verified.

As Enforde Engineering Services, we offer our Practical Consulting Service to manage our Eurovent Certification Processes to share our knowledge and experience with you.


“Model Box reference to EN 1886 standard of testing services offered by our company pre-assessment tests. In this way, the deficiencies are identified and the better results can be obtained without entering the product Model Box test.”


Despite having the Eurovent Certificate, the products of the companies may not have the same technical characteristics. The distinctive feature of the products that distinguish the products technically from each other; These are the classes determined according to the values measured in the Body Box Mechanical Resistance Test, Body Air Rain Test, Filter Bypass Leakage Test, Thermal Transmission Test, Thermal Bridging Test, Acoustic Insulation Tests made in accordance with EN 1886 standard on Model Box. It is important for end users to refer to these values to compare the products of the companies. These values are available at

Mechanical Properties of Air Handling Units According to EN 1886

  1. Mechanical Strength: Mechanical strength control is performed under the designing conditions of the air conditioning plant carcass structure under the amount of deflection (mm / m). The permanent deformation is controlled in this control. According to the measurement results; D1 <4 <D2 <10 <D3 (mm / m). D1 is the best class.

2.Casig Air Leakage;  The air leak amount that can be formed from the air handling unit body under 400 Pa negative and 700 Pa positive pressure is determined and classified. L1 <0,15 <L2 <0,44 <L3 <1,32 (l / cm2) at 400 Pa negative pressure L1 <0,22 L2 <0,63 <L3 <1,90 l / cm²). The L1 class is the best class.

3.Filter Bypass Leakage;  Under 400 Pa positive pressure, the classification is made by proportioning the amount of air passing through the filter frame of the air handling unit without filtering, to the total air flow. F9 <0,5 <F8 <1 <F7 <2 <F6 <4 <F5 <6 (% k). F9 is the best class.

 4.Thermal Transmission Test;  The tests and classifications for the determination of the thermal conductivity value of the air handling unit body and panel structure. Tests are carried out by providing a temperature difference of 20 K between the indoor and outdoor environment of the air handling unit and 0.1 m / s of air velocity on the outer surface. T1 <0,5 <T2 <1 <T3 <1,4 <T4 <2 <T5. T1 is the best class.

 5.Thermal Bridging Test;  It is a test that identifies and classifies the thermal bridges that may occur between the indoor environment and the outdoor environment at the bodywork of the air handling unit. If the temperature difference between indoor and outdoor is 20K, it is calculated based on points having the highest temperature value on the outside surface. Good ventilation means that the risk of choking in the air conditioning plant body is low. TB5 <0,3 <TB4 <0,45 <TB3 <0,6 <TB2 <0,75 <TB1 <1. TB1 is the best class.