The CSIA Certified Dryer Exhaust Technician® (C-DET) credential must be renewed every three years.
Take the Online ReviewComplete a review course, either online or in-person. The online review is also part of a CSIA eLearning subscription.
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OR
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Take the ExamTake and pass the exam again:
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Note: If your certification is lapsed more than 30 days and you have an expired certification, you must start the certification process over.