DuctStudy · updated October 1, 2026
DuctStudy is a free study site: practice questions for the NADCA ASCS and CVI exams, NADCA's dryer vent program, the CSIA C-DET and the IKECA CECT, plus trade lessons and a job simulator for new technicians.
DuctStudy is not affiliated with, endorsed by, or sponsored by NADCA, CSIA or IKECA. The practice questions are original, written from the published standards and codes. They are not real exam items. Standards and codes change, so check the current edition.
Studying here does not guarantee a passing score. The site is provided as it is, without warranty.
The lessons and the simulator teach general practice. They do not replace your employer's procedures, the equipment manual, the product label, or the code where you work.
Ask why and the job call grader are AI models. They can be wrong. If an answer or an explanation looks wrong, use Report a problem.
Use it to study. Don't scrape or resell the question banks, and don't share another person's sign-in.
What the site keeps and what leaves your device is on the Privacy page.