Your commercial kitchen’s rooftop exhaust fan plays an important role in removing heat, smoke, grease-laden vapours and cooking odours from the kitchen.
However, because the fan is normally located on the roof and out of sight, grease buildup can easily go unnoticed. Even when the visible canopy looks reasonably clean, grease may still be collecting inside the ductwork and around the exhaust fan.
Understanding the warning signs can help you arrange professional cleaning before the buildup becomes more difficult to manage.
Why does grease build up around the exhaust fan?
When fryers, char grills, wok burners and other cooking equipment are operating, grease-laden vapours rise into the canopy.
The exhaust system draws these vapours through the filters, canopy and ductwork before releasing the extracted air through the rooftop fan. While filters capture some grease, they do not prevent all grease and residue from travelling further into the system.
Over time, deposits can accumulate on accessible surfaces inside the ductwork and around the fan housing, blades and discharge area.
This can occur even when trade is quieter than usual. Your exhaust system responds to what and how often you cook, not simply how many customers you serve.
Signs your commercial kitchen exhaust fan may need cleaning
Grease buildup is not always obvious from inside the kitchen. However, there are several signs that may indicate your exhaust fan or complete exhaust system needs professional attention.
1. Reduced airflow through the canopy
If smoke, steam or cooking vapours are not being removed as effectively as they once were, there may be an airflow issue within the system.
Grease buildup around accessible areas of the fan and ductwork may restrict performance. Reduced airflow can also have other mechanical causes, so the system may need to be inspected to determine what is happening.
2. Excess heat or smoke in the kitchen
A properly operating exhaust system helps remove heat, smoke and cooking vapours from the kitchen.
If your kitchen is becoming noticeably hotter, smokier or less comfortable during service, the exhaust system may not be extracting air effectively.
3. Unusual fan noise or vibration
New rattling, vibration or unusual operating noises should not be ignored.
Grease buildup, wear, damage or an imbalance may affect the fan’s operation. Cleaning does not repair mechanical faults, but inspecting the fan during the cleaning process can help identify visible concerns requiring further attention.
4. Visible grease around the fan or rooftop outlet
Grease around the fan housing, roof outlet or surrounding surfaces is a clear indication that residue has travelled through the exhaust system.
Because these areas are generally not visible from inside the venue, the buildup can continue unnoticed between services.
5. Grease returns quickly after the canopy is cleaned
Regularly wiping the visible canopy is important, but it is not the same as professionally cleaning the complete kitchen exhaust system.
If grease, odours or airflow problems continue despite routine canopy cleaning, buildup may be present beyond the visible areas.
Why cleaning only the canopy may not be enough
The canopy is only one part of a commercial kitchen exhaust system.
A complete professional service should address the accessible sections of the system, which may include:
- The canopy’s internal and external surfaces
- Accessible ductwork
- The rooftop exhaust fan
- Relevant surrounding surfaces within the agreed service scope
The exact work required depends on the system’s design, accessibility, condition and cooking activity.
Cleaning the visible canopy without addressing accessible grease buildup further inside the system may leave important areas untreated.
How often should an exhaust fan be professionally cleaned?
There is no single cleaning schedule that is suitable for every commercial kitchen.
The appropriate frequency can be affected by:
- The type of food being prepared
- The cooking equipment used
- How often the equipment operates
- The volume of grease produced
- The system’s design and accessibility
- Previous cleaning history
- Venue, property-management or insurance requirements
A high-volume kitchen using fryers, char grills or wok burners may require more frequent cleaning than a venue undertaking lighter cooking.
Your schedule should be based on the cooking activity and condition of the complete system, not only how busy the venue feels.
What records should you receive after cleaning?
Clear service records make it easier to track the condition and maintenance history of your commercial kitchen exhaust system.
Following an eligible complete-system clean, Professional Canopy Cleaning GC can provide:
- Before-and-after photographs
- A detailed Job Completion Report
- A Certificate of Compliance after payment
Certificates of Compliance are only available for eligible complete kitchen exhaust system cleans. They are not issued for canopy-only cleaning.
We will cover these documents and what they mean in more detail in our next article.
Is your rooftop exhaust fan due for cleaning?
If you cannot remember when the rooftop exhaust fan and accessible ductwork were last professionally cleaned, it may be time to check the service history of your complete system.
Professional Canopy Cleaning GC provides commercial kitchen exhaust system cleaning across Brisbane, the Gold Coast and surrounding areas.
To request a quote, text photographs of your canopy along with your venue name and suburb to 0404 372 997. We aim to respond with your quote within 24 hours.
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