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ENGINEERING
Certification Programs
Certified Thermal Performance Standard
The Air Diffusion Council and Underwriters Laboratories Inc. have established a program to evaluate listed air ducts and air connectors for thermal resistance properties in accordance with the ADC Flexible Duct Performance & Installation Standard (1996), using ASTM C-518 (1991) at installed wall thickness on flat insulation only.
Look for this marking on the flexible duct products you purchase, as shown below.
The Air Diffusion Council has established a voluntary thermal performance certification program in which ADC member companies producing flexible ducts can participate.
Both the ADC certification program and the laboratory testing program, provided by Underwriters Laboratories, Inc. and Intertek Testing Services, are the result of the need for a uniform and verifiable system for certifying the thermal properties of flexible air ducts and air connectors.
ADC member products which are evaluated per this standard will bear the official ADC Seal of Certification, shown below.
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