The Certified Dryer Exhaust Technician (CDET) is a professional credential issued by the Chimney Safety Institute of America (CSIA). It certifies that a technician is trained to inspect, clean, and evaluate dryer exhaust systems to recognized safety and building-code standards. Dryer Vent Specialists is CDET certified and serves the San Francisco Bay Area Peninsula.

Who issues CDET certification?

CDET is issued by the Chimney Safety Institute of America (CSIA), a non-profit that develops training and certification for chimney and dryer-exhaust professionals. A technician earns the credential by passing the CSIA exam and renews it to stay current with code changes. You can verify a technician or company through the CSIA.

What does a CDET technician do?

A CDET technician inspects the full dryer exhaust system, measures airflow, and cleans the vent from the dryer connection to the exterior termination. They also confirm the duct material, length, and termination meet code, and they flag fire and airflow risks a general cleaner can miss.

What standards does CDET training cover?

CDET training is grounded in the codes that govern dryer exhaust systems:

  • IRC Section M1502 limits dryer exhaust duct length and requires smooth metal duct that terminates outdoors. Read IRC M1502.
  • UL 2158A is the listing standard for dryer transition duct. About UL.
  • NFPA 211 covers venting requirements for exhaust systems. Read NFPA 211.

Why does CDET certification matter?

Lint buildup is the leading cause of dryer fires. According to the U.S. Fire Administration, clothes dryers are involved in about 15,000 home fires each year, and failure to clean is the leading factor. A CDET-certified company brings verified, code-based training to every job, which lowers fire risk and keeps your dryer running efficiently.

"The leading cause of home clothes dryer fires is a failure to clean them." U.S. Fire Administration

Is CDET certification required?

CDET is not legally required to clean a dryer vent, but it is the recognized professional standard for the trade. Hiring a CDET-certified company is the simplest way to confirm the technician is trained to current dryer-exhaust codes instead of treating the job as a general cleaning.

Frequently asked questions

What does CDET stand for?

CDET stands for Certified Dryer Exhaust Technician.

Who certifies CDET technicians?

The Chimney Safety Institute of America (CSIA) develops and issues the CDET certification.

How can I verify a CDET certification?

You can confirm a technician's or company's CDET status through the CSIA at csia.org.

Is Dryer Vent Specialists CDET certified?

Yes. Dryer Vent Specialists is CDET certified through the Chimney Safety Institute of America and serves homeowners and property managers across the San Francisco Bay Area Peninsula.