An air duct cleaning technician inspects, cleans and restores the ductwork, air handlers and vents of HVAC systems in homes and commercial buildings, and joins restoration crews when water, fire or mold damage reaches those systems.
The work follows NADCA's ACR standard, and the certification NADCA ties to its member companies is the Air Systems Cleaning Specialist (ASCS).
NADCA sets no formal prerequisites for the ASCS exam; it recommends 2 to 4 years of field experience first.
What is a duct cleaning technician?
A duct cleaning technician inspects, cleans and restores the ductwork, registers, grilles, air handlers and other components of heating and cooling systems.
The work spans residential and commercial buildings.
The same job is posted as air duct cleaning technician, duct cleaner, air duct cleaner or HVAC duct cleaning technician.
It is a cleaning-and-restoration trade: the subject is the condition of the system rather than its installation.
NADCA publishes both the standard and the certification this trade works with.
Its Regular Members are companies actively engaged in performing residential, commercial and industrial air duct cleaning services, and those member companies keep a certified specialist on staff at each location — more on that below.
The work itself runs on NADCA's ACR standard, Assessment, Cleaning & Restoration of HVAC Systems, currently the 2025 Edition, which NADCA offers as a free download.
Duct cleaning sits beside two neighboring trades on this board: carpet cleaning, which shares the in-home service setting, and restoration, where the water, fire and mold losses are the events that pull a duct system into scope.
Employer types include dedicated duct cleaning companies, cleaning firms that add duct work to a carpet and upholstery service line, and restoration contractors that keep HVAC cleaning on their own crews.
What does a duct tech do on a job?
The standard's own title names the three parts of the work: Assessment, Cleaning & Restoration of HVAC Systems.
NADCA's ACR standard, currently the 2025 Edition, is a free download, and it is the document to read for how NADCA frames each part of a job.
Our research did not establish the specific equipment, setup or job sequence duct cleaning crews use, so this guide does not describe them.
For how a job is set up, cleaned and checked, read the ACR standard and follow your employer's own procedures.
On restoration jobs, the ACR standard sits beside the IICRC's S590 for assessing a system after water, fire or mold damage — covered below.
What hazards come with the work?
The settings are the first hazard: attics, crawl spaces, mechanical rooms and rooftops.
They are tight, dim and dusty, and the duct run decides the route, not the tech.
Movement, posture and access are a constant part of the job's physical reality.
Cleaning disturbs the dust and debris inside the system, and that dust is the point of the job.
How a crew contains and collects it is set by the employer's procedures, covered in the callout below.
Mold changes the job.
When a system or its ducts hold growth, the work becomes mold remediation territory, and EPA's mold remediation guide tiers the PPE accordingly.
Minimum protection is gloves, an N-95 respirator and goggles.
Limited PPE adds an N-95 or half-face respirator with HEPA filter and disposable overalls.
Full PPE is disposable full-body clothing, head gear, foot coverings and a full-face respirator with HEPA filter.
EPA describes a HEPA filter as one that can theoretically remove at least 99.97% of airborne particles 0.3 microns in size.
Smoke is the fire-loss version of the same problem.
Soot and smoke residue can travel through the system and settle in ductwork and the air handler, and post-fire duct work means handling that residue as part of the restoration scope.
Heat is the quiet one.
OSHA lists wearing clothing that holds in body heat — protective gear such as coveralls — and lack of acclimatization among the occupational risk factors for heat illness, which matters for crews in coveralls and respirators doing attic and crawlspace work in warm months.
Hazards are managed by the employer's program
What certification matters? NADCA's ASCS
In this trade, the certification NADCA ties to its member companies is the Air Systems Cleaning Specialist (ASCS).
Entry is deliberately open.
NADCA sets no formal eligibility prerequisites for the ASCS, and what the association recommends is 2 to 4 years of field experience before you sit the exam.
The exam costs $385 on NADCA's testing site, as of October 2026, and is offered at testing centers worldwide and at NADCA's Annual Meeting and Fall Technical Conference.
Keeping the certification is an annual job.
Renewal is due by June 30 every year, with six Continuing Education Credits and an annual maintenance fee — $95 for NADCA members, $920 for non-members.
A lapsed ASCS is re-earned by retaking the exam.
That staffing requirement is NADCA's own membership rule: NADCA Regular Member companies must keep at least one certified ASCS on staff at each location.
Individual technicians, though, do not have to be NADCA members to hold the certification — non-members can certify, and renew at the non-member maintenance fee.
The next credential up is NADCA's Certified Ventilation Inspector (CVI), which requires an active ASCS to sit its exam.
CVI runs on a different clock: valid for three years, expiring July 1 of the third year, and renewed only by passing an online renewal quiz.
One distinction keeps the paperwork straight: the ASCS is an industry certification, not a government license.
What a duct cleaning business needs beyond certification — contractor licensing, registrations — is set state by state, so confirm with your state's licensing agency rather than treating any certification as a license.
Certification terms change
How do duct techs work on restoration jobs?
Water, fire and mold losses pull HVAC systems into scope.
Air moves through ductwork while a system runs, so a system that ran during a fire can carry soot into the duct runs, and a system that ran through moldy conditions can move spores to the registers it feeds.
Two standards frame the work.
The IICRC's ANSI/IICRC S590 — Assessment of HVAC Systems Following a Water, Fire, or Mold Damage Event — covers assessing a system's condition after those events; its current edition is the First Edition, 2023, and a revision is under way.
Cleaning and restoring the system itself runs on NADCA's ACR standard, the same NADCA document covered above.
Mold is where the two trades meet most tightly.
New York City's 2008 guidelines on assessing and remediating fungi direct that professional help should always be considered for even small amounts of mold or moisture in an HVAC system.
They also require any antimicrobial used inside an HVAC system to be EPA-registered specifically for that use.
For building materials in general, the same guidelines say porous materials such as ceiling tiles and insulation should be removed and discarded; our research did not establish what NADCA's ACR standard says about duct liner.
A natural crew split on a restoration job: the remediation crew owns containment and the loss; the duct tech owns the system.
The duct tech assesses what the ductwork and air handler hold, cleans them to ACR, and documents the condition and the work for the project manager and the estimate.
That system knowledge carries over: duct techs can move into mold remediation and fire restoration work, and a restoration crew gains a tech who can take the HVAC scope off the mitigation crew's plate.
How do you become a duct cleaning technician?
NADCA sets no formal eligibility prerequisites for the ASCS exam, the recommended preparation is field experience, and the standard is a free download.
The route looks like this:
Get on a crew as a helper
NADCA sets no formal eligibility prerequisites for its ASCS exam, and the field experience it recommends is built on the job, working beside an experienced tech.Read the standard early
NADCA publishes the ACR standard — Assessment, Cleaning & Restoration of HVAC Systems, 2025 Edition — as a free download. Reading it early teaches the assessment-clean-restore vocabulary the standard is built on.Build the field time
NADCA recommends 2 to 4 years of field experience before the ASCS exam. The recommended years are the trade's own preparation, since there is no required course to sit the exam.Sit the ASCS exam and keep it current
The exam is $385 on NADCA's testing site as of October 2026. After you certify, renewal is due every year by June 30, with six Continuing Education Credits and the annual maintenance fee — $95 for members, $920 for non-members.Add depth where the work points
NADCA's Certified Ventilation Inspector (CVI) requires an active ASCS and renews on a three-year cycle by online quiz. On restoration-leaning crews, the IICRC's S590 standard for assessing HVAC systems after water, fire or mold damage is the reference to know.
Our research found no BLS occupation line for duct cleaning technicians, so this guide quotes no federal wage benchmark — pay is set by the employer, the local market and the offer.
When you are ready to look, the duct cleaning technician jobs board lists open positions with restoration companies, duct cleaning companies and cleaning contractors.
Career information, not legal, licensing or safety advice. Confirm certification requirements with NADCA, and licensing questions with your state's licensing agencies, before you act on anything here.