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Cooling towers
Certification manual
Certification Manual
Technical Certification Rules


The Eurovent Certified Performance (ECP) programme scope for Cooling Towers (CT), applies to factory packaged Cooling Tower product series (family) & subgroup ranges (or product lines) of Open & Closed-Circuit series Cooling Towers.

Eurovent Certita Certification (ECC) have a collaborative arrangement with USA based Cooling Technology Institute Est. 1950 (CTI) to use the CTI Thermal Performance Certification STD-201 (latest version) for certification compliance. 

There are three key requirement steps to achieve and maintain ECC certification in compliance to the CTI STD-201.  These being;

  1. Qualification Procedure,
  2. Repetition Procedure 
  3. Factory Audit*.

*Factory auditing is an additional scope item above that of CTI STD-201.  This will be explained further in Section "Factory Audit".

The programme applies to product series & sub-group ranges that:

  • Have already achieved and hold current certification by the COOLING TECHNOLOGY INSTITUTE (CTI) according to latest CTI STD-201OM
  • Are not in process or certified by CTI before 01/10/2010, manufactured by a company with their cooling tower headquarter or main facility located in the following areas (approved Eurovent Certita Certification areas):
    • Europe
    • Middle East, Africa
    • India.

For more information about the Cooling Technology Institute (CTI), click on the logo for the CTI home page : CTI logo

For more information about CTI Cooling Tower Certification, click on the logo for the CTI cooling tower certification programme page : CTI certified


During 2020 the programme committee for cooling towers worked to develop a certify-more principle, with a stepped introduction plan. This principle covers products that are sold into Europe and European markets as specified in the certification manual. 

a) Starting from January 1st 2022, all participants shall certify their main range with the scope of the certification programme, and main option. Any option representing more than 20% of unit quantity within a range shall be required to be part of the certified range. Also any new range released by the participant from January 1st, 2022 within the scope of certification shall declare it to Eurovent Certita Certification for inclusion of the certification process.
b) From January 1st, 2024 50% of all in scope certifiable units must be certified units. 
c) From January 1st, 2026 80% of all in scope certifiable units must be certified units. 


Cooling towers, also commonly known as evaporative heat rejection equipment, are a refrigeration system component designed to transfer heat from HVAC systems to the outdoor environment via water and air. Commonly used with chiller systems, cooling towers can be used in both buildings and processes, in a wide range of applications, from large residential to commercial and industrial.

Cooling towers are a specialised heat exchanger, in which air and water are brought into direct contact with each other, in order to reduce the water's temperature. Water heated by an industrial process or air-conditioning condenser, is pumped to the cooling tower through pipes. Once in the cooling tower, water sprays through nozzles onto banks of material called fill, which slows the flow of water through the cooling tower, and exposes as much water surface area as possible for maximum air-water contact. As the water flows through the cooling tower, it is exposed to air, which is pulled through the tower by a fan. When the water and air meet, a small amount of water is evaporated, creating a cooling action. The cooled water is then pumped back to the condenser or industrial process where the cycle starts again.

There are two main types of certified Cooling Tower:

  • Open-Circuit
  • Closed-Circuit 

These cooling tower types have the same design system purpose. However, closed circuit cooling towers reject heat from the water pipes to the air via a heat exchange coil, isolating the process fluid from the outside air, keeping it clean and contaminate free in a closed loop.


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 CT programme have the following search criteria in common:

Brand name of the manufacturer.

Listing of models with some common features.

Model name.

Web link
Is the URL of the manufacturers website.

List of models link
URL link to a downloadable ECC Certification Diploma listing models in the range that are certified.

Software name
Name of software selection tool.

Software version
Version of software selection tool.

Factory city
City of manufacture.

Factory country
Country of manufacture.


Search for certified products in our Cooling Tower programme via our certified product directory


The range of the certified thermal operating conditions shall not extend beyond the certified characteristics as per CTI STD-201, these being:

  • Entering wet bulb temperature: 10°C to 32.2°C (50°F to 90°F)
  • Cooling range > 2.2°C (4°F)
  • Cooling approach > 2.8°C (5°F)
  • Process fluid temperature < 51.7°C (125°F)
  • Barometric pressure: - 91.4 to 105.0 kPa (27" to 31" Hg)

Certification tests on cooling towers shall be conducted with the measured flow rate of the process fluid at no less than 60% or more than 140% of the midpoint of the published flow rate limits for the cooling tower model.

During the certification tests, the product shall be operating within the manufacturers recommended limits of hot water head/nozzle spray pressure.

Certification tests shall be conducted with a specific product operating within 10% of its rated fan motor output power.

Prior to evaluating the unit performance, the capacity at the test barometric pressure shall be adjusted to the standard barometric pressure using the equation below:

CSBP = CTBP/(1+K1)(BPStd-BPT))


CSBP=      Capacity adjusted to Standard Barometric Pressure
CTBP =     Capacity at Test Barometric Pressure
K1 =        Constant equal to .0023 for SI and 0.0078 for IP
BPStd =   Standard Barometric pressure equal to 101.325 kPa for SI and 29.92 in Hg for IP
BPT =     Test Barometric Pressure in kPa (in Hg)


Search for certified products in our Cooling Tower programme via our certified product directory

Find out how to apply for the Cooling Tower programme.

💡 For information

When using the Advanced Search Criteria function you can search via selection tool name and version.


Search for certified products in our Cooling Tower programme