Kitchen hood performance in food service operations

Area of Science:

• Food Service Operations
• Occupational Health and Safety
• Environmental Health

Background:

• Cooking fumes in food service operations create risks for food contamination, fire, and employee exposure to hazardous chemicals.
• Local exhaust ventilation, primarily kitchen hoods, is crucial for mitigating these risks.
• Current state codes mandate adequate ventilation, but kitchen hoods are not consistently inspected for performance, leading to potential safety gaps.

Purpose of the Study:

• To quantitatively assess the airflow rates of kitchen hoods in restaurants.
• To compare measured airflow rates against established industry guidelines.
• To evaluate the effectiveness of current inspection practices in identifying inadequate ventilation.

Main Methods:

• Conducted airflow rate measurements for 89 kitchen hoods across 60 restaurants.
• Compared measured flow rates with guidelines from the American Conference of Governmental Industrial Hygienists (ACGIH) and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
• Assessed hood cleanliness and correlated findings with sanitarians' inspection reports.

Main Results:

• Only 39% of hoods met ACGIH guidelines and 24% met ASHRAE guidelines.
• Inspecting sanitarians identified inadequate flow rates in less than 4% of cases.
• Hoods for heavy-duty cooking operations (broilers, charbroilers, woks) had the lowest compliance rate at 18%.

Conclusions:

• A significant portion of restaurant kitchen hoods do not meet recommended airflow standards, increasing risks associated with cooking fumes.
• Current inspection protocols may not adequately identify ventilation deficiencies, particularly for high-risk cooking equipment.
• Implementing regular, systematic inspections, potentially including hoods as a distinct checklist item, is recommended to enhance safety. Periodic checks on heavy-duty operation hoods are a practical approach.