What standard governs HVAC duct cleaning in Australia?

NADCA ACR 2021 (Assessment Cleaning and Restoration of HVAC Systems) is the internationally recognised technical standard for HVAC duct cleaning and is referenced by Australian and New Zealand cleaners. AS/NZS 3666 sets the framework for microbial control in air-handling systems AS/NZS 1668.2 covers mechanical ventilation requirements and the WHS Act 2011 establishes the PCBU duty to maintain a safe workplace. ISO 16890 governs the filtration that protects cleaned ductwork from rapid recontamination after the system is returned to service.

How do I tell whether ductwork actually needs cleaning?

NADCA ACR 2021 Table 4 sets the visual and measurement criteria. Loose particulate that exceeds the NADCA vacuum test threshold adhered debris covering more than a small portion of the duct surface visible mould or biofilm rodent or insect intrusion fibreglass liner shedding or post-event contamination from fire flood or construction works all indicate cleaning is required. Routine biennial inspection is the trigger mechanism. Cleaning itself is condition-based rather than calendar-based.

What is the difference between visibly clean and a particulate-test post-clean criterion?

Visibly Clean is the default NADCA ACR 2021 acceptance criterion and means no visible debris settled dust film or microbial indicators on accessible interior surfaces when viewed with adequate lighting. A particulate-test post-clean criterion is stricter and involves a NADCA vacuum test pad sample after cleaning with a maximum mass threshold (typically 0.75 milligrams per 100 square centimetres) before the duct is accepted. Particulate tests are normally specified for critical environments or where the original inspection found heavy contamination.

How often should commercial duct systems be inspected?

NADCA recommends visual inspection at least every two years in commercial buildings with cleaning triggered by findings rather than fixed scheduling. Healthcare laboratory and food production facilities typically inspect annually and may require post-clean particulate verification. Any IAQ complaint water ingress rodent or fire event triggers an inspection regardless of the calendar interval. Document every inspection in the asset record so condition history is available for trending and capital planning.

Can the duct cleaner also inspect fire and smoke dampers?

Visual confirmation of damper presence and gross condition can be recorded during a duct cleaning inspection but functional testing of fire and smoke dampers is a separate activity governed by AS 1851 (routine service of fire protection systems). Fire and smoke dampers require timed cycling tests under AS 1851 carried out by a competent fire systems technician not the duct cleaner. Note any visibly damaged or missing dampers on the duct inspection checklist for the client to address through the fire systems contractor.

Free duct cleaning inspection checklist

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Free HVAC duct cleaning inspection checklist (PDF-ready). NADCA ACR 2021 surface assessment particulate sampling and post-clean verification.

Jarrod Milford

Commercial Director

Updated 18 May 2026

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Updated 18 May 2026

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What is a duct cleaning inspection checklist?

A duct cleaning inspection checklist is a structured form used by HVAC technicians and air quality specialists to assess the cleanliness of supply return and exhaust ductwork before during and after a cleaning project. It records surface contamination levels particulate accumulation microbial visual indicators access point locations and post-clean verification readings against the NADCA ACR 2021 standard. The checklist drives a defensible decision on whether ductwork requires cleaning what cleaning method is appropriate (mechanical agitation with negative air contact vacuuming or hand wiping) and whether the result meets the post-clean acceptance criteria before the system is returned to service.\n\nIn Australia HVAC duct hygiene falls under the WHS Act 2011 duty to maintain a safe workplace and AS/NZS 3666 requires that air-handling systems be maintained to control microbial growth including Legionella. NADCA ACR 2021 (Assessment Cleaning and Restoration of HVAC Systems) is the internationally recognised technical standard referenced by Australian and New Zealand cleaners and ISO 16890 governs the filtration that protects cleaned ductwork from rapid recontamination. A documented inspection checklist provides the photographic and measurement evidence that ductwork was assessed and cleaned to standard supporting indoor air quality complaints insurer claims and compliance audits. MapTrack helps facilities teams retain duct inspection records linked to each AHU and duct run so historical condition can be tracked over multiple cleaning cycles.

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Benefits of using this duct cleaning inspection checklist

NADCA ACR 2021 alignment: structures every inspection against the internationally recognised cleaning standard so the result is defensible to clients insurers and air quality auditors
Pre-clean baseline: photographic and measurement evidence captured before work starts protects the cleaner from disputes about pre-existing damage or contamination
Method selection: surface assessment of loose particulate adhered debris and microbial indicators drives the correct choice of negative-air contact vacuuming or hand wiping
IAQ protection: catches mould rodent intrusion and fibreglass shedding that recirculate through occupied zones and trigger sick-building complaints from tenants
Post-clean verification: surface witness samples and visual inspection confirm the duct meets NADCA Visibly Clean acceptance criteria before the system is returned to service
Compliance documentation: signed inspection records support WHS audits lease obligations and tenant indoor air quality complaints with defensible evidence

Benefits of digitising forms in MapTrack

When you digitise hvac ducting checklists in MapTrack, you get:

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What to include in a duct cleaning inspection checklist

This duct cleaning inspection checklist covers 10 key areas:

Project and site details: building level AHU served duct system designation and inspection date
Access points: location type (panel hinged access door or removed grille) and any new access points cut during the project
Surface contamination assessment: loose particulate adhered debris fibreglass shedding corrosion and microbial visual indicators per NADCA Table 4
Particulate sampling: NADCA vacuum test pad results in milligrams per 100 square centimetres for supply return and exhaust
Microbial assessment: visible mould or biofilm presence tape-lift sample location and any submitted laboratory report reference
Damage and defects: torn internal liner damaged duct seams missing fire dampers or volume control dampers found during access
Photographic record: before and after photos at each major access point with timestamp and location reference
Equipment and method: cleaning method used equipment list negative air machine HEPA filter rating and chemical applied if any
Post-clean verification: NADCA Visibly Clean criteria met for accessible surfaces and post-clean particulate sample if specified
Final sign-off: cleaner trade qualifications supervisor sign-off and client acknowledgement

How to use this duct cleaning inspection checklist

Plan the system and review drawings: obtain the AHU schedule and as-built ductwork drawings identify all supply return and exhaust runs locate existing access points and plan where new access doors will be cut for hose insertion
Conduct a pre-clean walkthrough: open every accessible panel photograph the internal duct surface at each location measure particulate accumulation and assess surface contamination against NADCA ACR 2021 Table 4 categories
Document microbial indicators: where visible mould slime or biofilm is found photograph the area record the location and dimensions and tape-lift sample for laboratory analysis if the client or specification requires it
Select the cleaning method and equipment: based on the surface assessment choose negative-air mechanical agitation contact vacuuming or hand wiping and confirm the negative air machine HEPA filter is rated at least 99.97 percent at 0.3 microns
Carry out cleaning to NADCA acceptance criteria: section by section agitate or vacuum the duct interior work upstream to downstream so dislodged debris is captured by the negative air collector and never leaves the duct system
Verify post-clean condition: re-open each access point photograph the cleaned surface confirm it meets NADCA Visibly Clean acceptance criteria (no visible debris dust film or microbial indicators) and take a post-clean particulate sample where the specification demands it
Restore the system and sign off: seal all access doors with approved tape or hardware replace filters in the AHU return the system to service complete the inspection checklist with signatures and lodge photographic records and any laboratory reports with the client

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How often should you complete this checklist?

NADCA ACR 2021 recommends visual inspection of HVAC ducts every two years in commercial buildings with cleaning triggered by inspection findings rather than a fixed calendar interval. AS/NZS 3666 requires air-handling systems to be maintained so microbial growth is controlled and IAQ complaints or post-event remediation (fire flood rodent intrusion construction works) typically warrant an immediate inspection regardless of schedule.\n\nCritical environments such as hospitals laboratories and food production sites may require annual inspections with stricter visibly clean criteria. The Australian WHS Act 2011 requires the PCBU to maintain plant so it remains safe and documented duct inspections support compliance with both AS/NZS 1668.2 ventilation requirements and lease IAQ obligations. MapTrack scheduling can automate biennial inspection reminders against each AHU and duct system.

Frequently asked questions

Applicable regulatory standards

This template aligns with the following regulations and standards:

NADCA ACR 2021
AS/NZS 3666
AS/NZS 1668.2
ISO 16890
WHS Act 2011

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