Frequently Asked Questions

NFPA 96 requires cleaning frequency based on cooking volume: monthly for high-volume operations like 24-hour diners, quarterly for moderate-volume restaurants, and semi-annually for low-volume kitchens. Grease accumulation rate determines the schedule—systems cooking with solid fuel need monthly cleaning regardless of volume.

NFPA 96 compliance means cleaning removes grease down to bare metal throughout the entire exhaust system—hood, ducts, fans, and all accessible areas. Inspectors look for complete grease removal, not surface cleaning. Documentation proving this level of cleaning is required for fire and health inspections.

Grease travels through ducts and accumulates on fan blades, housing, and motors, reducing airflow and creating fire hazards. Fan cleaning removes this buildup while lubrication and belt inspection prevent mechanical failures. Fans caked with grease can't move air properly, causing smoke backup in kitchens.

Full system evaluations check grease thickness in hoods, ducts, and fans, identify code compliance gaps, test airflow performance, and document maintenance needs. Inspections prepare kitchens for fire marshal or health department visits by catching issues beforehand and providing written compliance reports.

Baffle filters need cleaning every one to two weeks depending on cooking volume, but warped, damaged, or heavily corroded filters require replacement. Filters that no longer fit tightly or have broken baffles allow grease to bypass into ductwork, defeating their purpose and increasing fire risk.

Duct cleaning accesses the enclosed vertical and horizontal ductwork behind walls and above ceilings where grease deposits accumulate out of sight. Hood cleaning addresses visible surfaces. Fire code violations typically occur in ducts because grease buildup goes unnoticed until inspections, making duct access and documentation critical.

Grease buildup adds weight and restricts blade rotation, while lack of lubrication causes bearings to seize. Worn belts slip or break, and motors overheat when fans work harder against grease-restricted airflow. Regular cleaning and lubrication prevent most mechanical failures before they cause kitchen shutdowns.

When grease clogs ducts and fans, airflow drops and smoke can't evacuate properly, filling the kitchen. Thorough cleaning restores designed airflow capacity, pulling smoke and odors out efficiently. If problems continue after cleaning, fan motors or ductwork design may need evaluation for adequate capacity.

Inspectors require service reports showing cleaning dates, areas accessed, grease thickness measurements, and confirmation of bare metal standards. Before-and-after photos and American Fire Prevention certification validate compliance. Missing or incomplete documentation can result in violations even when systems appear clean.

Scheduled cleaning and inspections catch grease buildup, worn belts, failing motors, and airflow problems before they cause equipment failures during service. Maintenance plans space services based on cooking volume, preventing emergency shutdowns and keeping kitchens compliant between fire inspections year-round.

Fan motor replacement, belt and pulley changes, damaged hood panel repairs, and access panel fixes restore function without replacing entire systems. Airflow troubleshooting often identifies repairable issues like blocked ducts or misaligned fans. Full replacement is typically needed only when ductwork is severely damaged or improperly designed.

Food trucks accumulate grease just as quickly in smaller spaces, and confined exhaust systems create higher fire risks when neglected. NFPA 96 standards apply equally to mobile operations. Cleaning frequency depends on cooking volume and menu—fried foods and grilling require more frequent service than light prep work.