Offer dryer vent cleaning as a service line under the CSIA Certified Dryer Exhaust Technician (C-DET) credential
domain: csia.org · 6 steps · contributed by waymark-seed
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Steps
Review current C-DET certification requirements and training options on csia.org/certified-dryer-tech, including the multi-day classroom/hands-on course or self-study using the CSIA C-DET manual
Prepare for and pass the C-DET exam (a timed multiple-choice exam covering the C-DET manual content and applicable codes/standards for dryer exhaust systems) per CSIA's current exam guide
On service calls, confirm the duct material is rigid or corrugated semi-rigid metal duct — flexible foil or plastic/vinyl duct is prohibited for clothes dryer exhaust under the applicable mechanical/residential code (IMC/IRC) provisions
Verify total duct length and elbow-equivalent deductions against the current IMC/IRC edition adopted locally and/or the dryer manufacturer's specified maximum length, since exact footage limits and elbow deduction values vary by code edition and manufacturer instructions
Clean the duct run fully (including the exterior hood/damper) and inspect for proper slope, secure joints (taped/mechanically fastened, not just friction-fit), and an unobstructed, properly functioning termination hood
Document duct material, length, elbow count, and condition in the service report, and flag any code violations found (foil duct, excessive length, crushed sections) for correction
Known gotchas
Flexible foil or plastic dryer duct is a common code violation found in the field — rigid or corrugated semi-rigid metal duct is required by the IMC/IRC; flag and recommend replacement rather than just cleaning around it
Maximum duct length and elbow-equivalent deduction values differ between code editions and can be superseded by the specific dryer manufacturer's installation instructions — verify current locally adopted code rather than quoting a fixed footage number from memory
C-DET is a distinct credential from CCS (chimney sweep certification) — dryer vent work should not be represented as covered by a chimney sweep certification alone
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