How often should you clean a commercial kitchen exhaust system?

How often should you clean a commercial kitchen exhaust system? 

In most commercial kitchens, exhaust systems are cleaned every 3 to 6 months. 

High-volume kitchens may require cleaning as often as once per month. Lower-volume operations can extend this to once or twice per year. 

The correct frequency depends on three factors: 

• Type of cooking 

• Volume of production 

• Amount of grease generated 

The more grease produced, the faster the system becomes contaminated. 

Why cleaning is required in the first place 

A commercial kitchen exhaust system removes heat, smoke, and airborne grease from cooking. 

As this air moves through the system: 

• Larger grease particles are captured in the hood or filters 

• Smaller particles continue into ducts and fans 

Over time, these particles attach to surfaces. 

This creates a layer of grease inside:

• Filters 

• Ductwork 

• Fans 

This buildup begins immediately and increases with every hour of operation. 

How fast grease builds up 

Grease accumulation is not linear. It accelerates over time. 

At first, a thin layer forms. This layer becomes sticky and captures more particles. 

As buildup increases: 

• Airflow becomes restricted 

• System efficiency decreases 

• Heat is retained in the kitchen 

In high-volume kitchens, measurable buildup can occur within weeks. 

What happens if you clean too infrequently 

Delaying cleaning has clear consequences. Here are a few of them:

• Reduced airflow: As grease accumulates, air struggles to pass through the system. This reduces ventilation performance and increases heat in the kitchen. 

• Increased fire risk: Grease is flammable. When it accumulates inside ducts, it creates a continuous fuel source. 

• Higher energy consumption: Fans must work harder to maintain airflow, increasing energy usage. 

• System wear: Restricted airflow puts stress on fans and components, reducing system lifespan. 

What happens if you clean frequently 

Frequent cleaning reduces risk, but introduces new costs:

• Repeated service visits 

• Operational disruption 

• Labour coordination 

• Ongoing expenses 

In many kitchens, cleaning becomes a recurring operational burden. 

Why cleaning alone is not a long-term solution 

Cleaning removes grease that has already accumulated. 

It does not prevent new grease from entering the system. 

This creates a repeating cycle: 

• System becomes contaminated 

• Cleaning is performed 

• System returns to operation 

• Contamination begins again 

The underlying condition remains unchanged. 

What happens when grease is removed at the source 

Most ventilation systems are designed to handle grease after it has entered the system. 

A different approach removes grease before it spreads. 

This changes how the system behaves: 

• Ducts stay clean 

• Airflow remains stable 

• Maintenance is reduced 

Cler uses a filter-free separation process to remove particles directly in the airflow. 

No filters. No buildup. No performance drop. The system runs continuously, without interruption.