https://nadca.com/hvac-certification-education-training/certified-ventilation-inspector-cvi/how-renew-cvi
How to Renew CVI Certification | National Air Duct Cleaners Association (NADCA)
The CVI certification is valid for three years, and expires on July 1 of the third year. CVI renewal is processed after taking and passing an online quiz. Find...
how to renewcvi certificationair duct