09/04/2025
The Cooling Technology Institute provided an update on the progress of the Sound Certification Program. The new Sound Certification program will be conducted in accordance with CTI Standard 204, which was approved by the CTI Board of Directors in April 2025. In conjunction with Sound Certification, the Sound Measurement Test Code, CTI ATC 128, has been updated with a release in February 2025, whose Section 8 for Small Towers will provide the measurement methodology for this program.
To be eligible for Sound Certification, the equipment must first be Thermal Performance Certified based on CTI Standard 201. By purchasing a CTI Sound Certified model, an owner/operator has assurance the heat rejection device will perform thermally as specified, as well as comply with the Manufacturers published sound pressure ratings.
The Thermal Certification Program includes 108 manufacturers and 30 private brand affiliates from around the globe. The program participants currently offer more than 290 certified open and closed-circuit cooling towers as well as dry cooler product lines encompassing a total of over 85,000 individual models available to the market. All participating manufacturers who are interested in certifying their heat rejection equipment for sound are invited to do so by filling out the certification inquiry form and indicating your interest in Sound Certification.
Several applications have already been submitted to the Sound Certification Administrator. These applications are being reviewed, and sound verification testing will commence in the coming months. CTI will continue to accept and review applications from this point forward.
The Sound Certification Program and the Thermal Certification Program are both continuously open to applications for new manufacturers and/or new product lines. The CTI also encourages those manufacturers with lines that are not thermally certified to apply for thermal certification under the CTI STD 201 program by contacting the Thermal Certification Administrator.
The current versions of STD 204 OM (operations manual) and STD 204 RS (ratings standard), along with the companion Acceptance Test Code (ATC) 128, are available for a nominal charge on the CTI Marketplace.
About Cooling Technology Institute
The Cooling Technology Institute is an international non-profit organization committed to advancing the technology, design and performance standards of cooling towers and related systems. CTI provides a platform for industry leaders to collaborate on research, education and the development of best practices. For more information, visit https://www.cti.org.
