Maintenance
There is no single interval that suits every kitchen. Here is what decides how often your canopy, ducts, exhaust fan and grease filters need cleaning, and how to build a schedule around it.
· 6 min read
Maintenance
What Happens If You Don't Clean Your Kitchen Exhaust?
A dirty kitchen exhaust rarely causes trouble overnight. Skipping exhaust cleans saves money in the short term. Here is what grease does to canopies, ducts and fans over time, and the knock-on effects for safety, hygiene, inspections and insurance.
By Apex Commercial Exhaust · · 5 min read
Key takeaways
- Grease keeps accumulating in the canopy, plenum, ducts and fan every time you cook.
- Accumulated grease is combustible and can help a fire spread through the exhaust system.
- Heavy build-up can contribute to poor extraction, smoke, odours and equipment wear.
- Neglect can create problems with food safety inspections, building obligations and insurance conditions.
- Regular, documented cleaning is simpler and usually cheaper than dealing with heavy build-up later.
If a kitchen exhaust is never cleaned, grease does not go away. It keeps accumulating in places you cannot see, and the effects show up slowly: in safety, hygiene, performance and paperwork.
Grease keeps building up
Every service sends grease-laden vapour into the canopy. Filters catch part of it; the rest settles in the plenum, along the ducts and on the fan. Over months, a light film can become a thick, sticky layer that is harder and slower to remove.
The main risks of a dirty kitchen exhaust
Fire hazard
Accumulated grease is combustible and can help fire travel through the system. See how grease spreads fire.
Poor extraction
Blocked filters and contaminated ducts can contribute to smoke and heat lingering in the kitchen.
Hygiene
Grease can drip from canopies and gutters. Food premises are expected to be kept clean, without accumulations of grease.
Equipment wear
Grease on fan blades and housings can contribute to imbalance and maintenance problems.
Inspections, obligations and insurance
Food safety rules require ventilation that removes fumes, smoke, steam and vapours, and premises and equipment that can be kept clean (Standard 3.2.3; FSANZ guide).
Read about building obligations and insurance
Where a building has essential safety measures, Victorian owners must keep them maintained and keep records (Building and Plumbing Commission). Some insurance policies also include conditions about exhaust cleaning and records. Missing records can make it harder to show what maintenance was done. Our records guide explains what to keep.
Why waiting usually costs more
Heavy, hardened deposits take more time to remove than light, regular build-up, and very contaminated systems may need extra access or assessment. Regular cleaning keeps each job smaller and gives you a steady record. Within the agreed scope, Apex cleans all accessible and reachable areas of the kitchen exhaust system.
What to do if your exhaust has not been cleaned in a while
- Stop and look for visible signs: dripping grease, soiled filters, smoke (see the 7 warning signs).
- Book an inspection and clean of the canopy, plenum, ducts, fan and filters.
- Set a schedule based on what the clean finds, and keep records from now on.
Frequently asked questions
Can a very dirty exhaust still be cleaned?
Heavy grease can often be removed using suitable degreasing and manual methods. Results depend on access, grease condition and existing staining or damage.
Will cleaning fix poor extraction?
Removing grease may support airflow, but poor extraction can also come from fan faults or design issues, which may need a qualified technician.
Is the canopy enough to clean?
No. Grease also settles in the plenum, ducts and fan, so a complete clean covers those accessible areas too.
References & further reading
Government, regulator and Standards sources mentioned in this guide (links checked November 2026; requirements can change, so check the current version):
- Food Standards Australia New Zealand, via the Federal Register of Legislation, Standard 3.2.3 Food Premises and Equipment (Australia only)
- Food Standards Australia New Zealand (FSANZ), Safe Food Australia: A guide to the Food Safety Standards
- Standards Australia, AS 1851-2012 Routine service of fire protection systems and equipment
- Building and Plumbing Commission, Victoria (formerly the Victorian Building Authority), Essential safety measures (building owner guide)
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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