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A canopy-only wipe-down and a complete exhaust system clean are very different jobs. Here is what a full commercial kitchen exhaust clean can include, and the questions to ask before you book.
· 7 min read
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Kitchen Exhaust Duct Cleaning: How It Works and Why It Matters
Exhaust ducts are where grease hides. Here is how commercial grease duct cleaning works, what access is needed, and why the ductwork matters as much as the canopy.
By Apex Commercial Exhaust · · 6 min read
Key takeaways
- Grease settles along horizontal runs, vertical risers, bends and transitions inside the ductwork.
- Ducts are cleaned through access openings using scraping, brushing and controlled degreasing.
- Some systems need extra access panels before effective cleaning is possible.
- Any area that cannot be accessed should be clearly identified in the report.
- Insurer guidance commonly calls for duct cleaning at least yearly, and more often for heavy use.
Exhaust ductwork carries grease-laden air from the canopy to the exhaust fan, often through ceilings, risers and roof spaces. Because you cannot see inside it, duct grease is easy to forget. Here is how kitchen exhaust duct cleaning works and why it matters.
Where grease collects in ductwork
- Horizontal runs: grease settles along the bottom of long flat sections.
- Bends and transitions: changes of direction slow airflow and collect deposits.
- Vertical risers: grease can coat walls and drain down.
- Near the fan: the last section before the rooftop fan.
How ducts are cleaned
Suitable methods include controlled scraping, mechanical brushing, manual grease removal and degreasing, chosen to suit the duct construction, grease condition and safe access. Many ducts can be cleaned in place through existing access openings. Within the agreed scope, Apex cleans all accessible and reachable areas of your ductwork. See kitchen exhaust duct cleaning.
Why access matters
Read about access panels and inaccessible areas
Ducts can only be cleaned where they can be reached. Some systems have long sections without access openings, or bends that cannot be reached from existing panels. In those cases additional access arrangements may be needed. The ABCB’s guide to NCC clause F6D12 notes that kitchen exhaust hoods must comply with AS 1668.1 and AS 1668.2; design and installation matters such as these sit with your mechanical contractor.
A good report clearly lists any sections that could not be accessed, so you know exactly what was cleaned.
How often should ducts be cleaned?
It depends on cooking style, volume and inspection findings. As published examples, Chubb’s risk bulletin refers to AS 1851 and suggests exhaust ductwork at least yearly, and Vero’s guidance suggests the duct system at least every six months, with both calling for more frequent cleaning in heavy-use or deep-frying kitchens. Check your own obligations and insurer conditions.
Frequently asked questions
Can kitchen exhaust ducts be cleaned without removing them?
Many ducts can be cleaned in place using existing access openings. Some systems need additional access before effective cleaning is possible.
How do I know if my ducts are dirty?
Visible grease at accessible openings, overdue cleaning records or inspection findings can indicate contamination. Internal condition should be assessed by competent personnel.
Do you clean vertical exhaust risers?
Accessible vertical risers can be cleaned using methods suited to their configuration, height and access.
References & further reading
Government, regulator and Standards sources mentioned in this guide (links checked November 2026; requirements can change, so check the current version):
- Chubb Insurance Australia, Commercial kitchens fire protection fundamentals (risk bulletin)
- Vero Insurance (AAI Limited), RM Insight: Cleaning of ducts and flues
- Australian Building Codes Board (ABCB), NCC guide: F6D12 Kitchen local exhaust ventilation
- Standards Australia, AS 1668.1-2015 The use of ventilation and air conditioning in buildings, Part 1: Fire and smoke control in buildings
- Standards Australia, AS 1668.2-2024 The use of ventilation and air conditioning in buildings, Part 2: Mechanical ventilation in buildings
Need help with your kitchen exhaust? Apex Commercial Exhaust cleans canopies, exhaust ducts, rooftop fans and grease filters for commercial kitchens across Melbourne and Victoria.
This article is general information only and is not legal, insurance or compliance advice. Requirements for your kitchen depend on your system, building and obligations.
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