Earning the CSIA Certified Dryer Exhaust Technician Credential

The CSIA Certified Dryer Exhaust Technician®  program is a comprehensive examination that is administered and graded by the Chimney Safety Institute of America. The examination evaluates a Dryer Exhaust Technician's understanding of the basic information technicians must master to become competent dryer exhaust safety and fire prevention specialists such as:

  • Applicable building codes
  • NFPA 211 and NFPA 54 standards
  • All facets of inspecting and cleaning residential and commercial dryer exhaust systems

How can I become a C-DET®?

To earn the CSIA Certified Dryer Exhaust Technician credential, applicants must attain a score of 80 percent or higher on the examination. Applicants will receive pass/fail notification within 2-4 weeks of the test date. Candidates who score below 80 percent may retest at a lesser fee if the retest is taken within six months. After six months, the full examination fee will be charged.


1. Buy the manual

2. Complete the review (optional).
Unlike the CCS credential, C-DET® does not require a review to be completed before you  take the exam. However, the review is recommended especially if you are new to the industry.  You can take this review 
online or in-person.    

3. Pass the C-DET® exam. Cost is $379, or $179 if your company is a member of the National Chimney Sweep Guild.

About the CSIA Certified Dryer Exhaust Technician® Exam
The C-DET examination is composed of 50 multiple-choice questions. CSIA allows a maximum of 30 minutes for candidates to complete the test. The use of notes or reference material, including the CSIA Certified Dryer Exhaust Technician® manual is forbidden during the examination. The exam is now available online and ready to be administered by proctors approved by CSIA found here, or by a local proctor such as a community college, university, or learning center. The proctored exam request can be found here  or you can take the exam after an in-person review.    

Additional resources

For consumer information and to read up on clothes dryer exhaust and clothes dryer venting, go to CSIA's special website, Dryer Safety.


An Online Review Session is Available

The online Certified Dryer Exhaust Technician (C-DET) review provides exam candidates with a convenient and affordable guided learning experience. Daily reading assignments from CSIA’s Certified Dryer Exhaust Technician study manual coincide with four online lessons and interactive quizzes designed to help you pass the C-DET exam. 

Download this special two-page brochure that highlights the benefits of CSIA certification in a whole new way!

Search for a CSIA Certified Professional

Simply enter your Zip Code and click Search for a list of the CSIA Certified Chimney Sweep®s and CSIA Certified Dryer Exhaust Technician®s within a 50 mile radius of your location.