All cookers leave some form of residue in the ventilation system. Not some form of visible residue on the bench or fat left in the oil fryer basket, but a very fine mist of greasy vapours that are produced as a result of the heat rising and passing through the filters to end up as deposits on the inner walls of the ducting system.
In Muswellbrook, knowing exactly how this residue travels and what happens to it once it gets to the ventilation system is the first step towards mitigating risks through professional grease cleaning Muswellbrook.
Why Grease Is the Most Underestimated Hazard in a Working Kitchen?
Grease in a duct acts as a source of fuel. A commercial kitchen supplies heat and oxygen at every instance of use, and when combined, these three factors create the fire hazard condition combination that is known to be the most dangerous according to the fire literature for food-service environments. The Restaurant Fire Safety Guide published by Fire and Rescue NSW lists ignition of fat deposits in range hoods and ducting systems as one of the most frequently encountered fire hazards in the food preparation business.
According to the AIRAH Commercial Kitchen Exhaust Management Best Practice Guide (2022), duct fires tend to be highly intense and produce heat energy that, by means of radiant heat transfer, can ignite combustibles even outside of the duct itself. In other words, a fire in a ventilation system is not always confined to the duct but may involve the entire ceiling cavity and structural members.
The Parts of the Kitchen Most Affected by Grease Build-Up
Grease accumulates across more of the extraction system than most operators expect:
- The range hood and canopy interior, including the baffle or mesh filter housing and its frame.
- Grease channels and drip trays that collect runoff during cooking.
- The duct interior through bends, transitions, and horizontal sections where grease settles and hardens over time.
- The exhaust fan housing and impeller blades, where grease loading reduces airflow and stresses rotating components.
- The discharge cowl at the roof or wall exit, where grease can drip and be redistributed.
Each of these areas behaves differently and requires a different approach to clean properly. A surface clean of the canopy exterior, or a rinse of the visible filter, does not address any of them.
What Does Grease Do to Equipment Performance Over Time?
The risk of fire is the most pressing one, but grease build-up has adverse effects on the equipment in a way that makes owners lose money long before anything catches fire. The clogged filter makes the resistance in the whole system higher and the fan works with the increased load to ensure that the designed volume of air passes. The fan works with increased power, generates extra heat and accelerates wear of bearings. As a result, the whole assembly wears down prematurely because of the increased workload.
Lowered airflow because of the malfunctioning system also means that more grease-filled vapours get out of it and deposit on the walls, ceiling, lighting fixtures, and stored equipment. In addition, staff working in the kitchen with such an extraction system get exposed to increased amounts of heat and fumes. It is an independent Work Health and Safety issue.
What a Complete Grease Clean Address and What a Schedule Should Reflect?
The complete grease clean service includes degreasing of the whole path of the airflow. Filters are completely degreased. Access to the ducts is provided either via existing panels or via new ones and grease is removed with commercial-grade degreasers and mechanically. The fan is cleaned in order to restore its ability to provide airflow. According to the AIRAH 2022 guidelines, it is recommended to measure the thickness of the grease build-up at standard points and use the result to determine the time to the next service depending on the accumulation rate.
Muswellbrook Shire Council requires all food businesses to register according to the Food Act 2003 and the environmental health officers conduct inspections at registered businesses in order to check their compliance with food safety standards including the physical condition of the kitchen. Professional cleaning records are the best proof that the extraction system was maintained correctly. These records have to be consistently kept at every cleaning session and they are the protection in case of inspection, fire claim assessment and any other need for proving proper management.
