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Scope of certification

The Eurovent Certification Programme for Cooling Towers applies to product ranges (or product lines) within the category of Open & Closed-Circuit series Cooling Towers.

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 and 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".

For more information about the Cooling Technology Institute (CTI), follow the link below to the CTI home page :CTI_Logo

For more information about CTI Cooling Tower Certification, follow the link below to the CTI cooling tower certification program page :CTI_Certified

Testing requirements

a. Qualification procedure

To enable qualification to take place, the manufacturer shall provide to the independent agency selected by ECC a completed Data of Record (DOR) and performance tabulation for each product range compliant to the CTI STD-201.  A product performance range analysis will be conducted by the independent agency and one model in each product range will be selected by the agency to support the qualification thermal performance test.

These tests can be conducted in a climate controlled environment test laboratory; an outdoor test facility owned by the manufacturer, at an independent institution or at a suitable field test site location (unit no older than 12 months from the date of inspection) where the wet bulb temperature and thermal test conditions are within the specified CTI STD-201 limits, see Section IV.  

The independent test agency shall send a test report to ECC, this then be transferred to the manufacturer, together with the test conclusions.   Note: any Laboratory or field test shall conform to the provisions of the latest version of the CTI Test Code ATC-105.

b. Repetition procedure

Thermal performance conformity is verified on an annual base by an independent test agency selected by ECC, which performs a test of one model per product range.  As with the initial qualification testing no unit shall be older than 12 (twelve) months from the date of the inspection.

If during the course of any given year the manufacturer makes any changes to the declared certified range or if a new product range would like to be certified, the manufacturer shall send an updated DOR, the qualification process shall be re-introduced for those specific product range / models.

Factory audit

Purpose of the audit is to:

  • verify that the applicant builds the equipment that conforms as per registered data of record from each relevant factory; if products from the certified range cannot be observed in the factory, then field installations of models of that range sold in that year from the unavailable factory shall be audited;
  • identify any issues that may arise with regard to differences in regional sourcing of components, such as fans, fill, nozzles etc.

Purchase specifications for the following components must comply with the data of record submitted:

  • Fans;
  • Fill or raw material for fill in case of own production (e.g. pvc or pp);
  • Eliminators;
  • Air inlet louvers.

In addition, the following items will be verified during the audit:

  • Model number from nameplate;
  • Exterior dimensions;
  • Motor capacity;
  • Drive combination/ gear ratio;
  • Fan type (brand and model), material, no of blades;
  • Fill type, material, no of layers, no of blades;
  • Tower geometry;
  • Water distribution design, nozzle type and number;
  • Eliminator type, material;
  • Features as per physical data sheet.
Certified characteristics

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: - 12.8°C to 32.2°C (55°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=      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)

Thermal Performance Capability (%) - PASS / FAIL

In the event a model tested under any of the provisions of the CTI STD-201 including initial qualifying tests, fails to demonstrate a thermal performance capability of at least 100% (with an allowable tolerance of -5%) it shall be considered a test failure and provisions with the CTI STD-201 paragraph 9.5 shall apply, see Section 9 - Conformance.

TPC % = CSBP (m3/h) / Predicted Flow rate (m3/h) * 100


m3/h = Meter cubed per hour

TPC = Thermal Performance Capability

General Reference documents

Certification Manual 15th (January 2019)
Reference documents

OM-4-2019 CT

RS 9C001-2019