Grease Trap and Kitchen Exhaust Hood Cleaning (NFPA 96)

Important Disclosure: Kitchen exhaust hood cleaning is a specialized fire protection service requiring specific certification, training, and insurance. This article provides overview information, but if you want to offer hood cleaning professionally, you must complete proper NFPA 96 training and certification.

Kitchen exhaust hood cleaning isn’t pressure washing. It’s fire protection service governed by NFPA 96. Wrong methods lead to restaurant fires, injuries, and deaths.

Understanding kitchen exhaust systems

Commercial kitchens produce massive amounts of grease from cooking. Without proper cleaning, this grease accumulates in exhaust systems and becomes a serious fire hazard.

How kitchen exhaust works:

1. Cooking produces grease-laden vapors from fryers, grills, ranges
2. Vapors rise into capture hood over cooking equipment
3. Grease filters capture some grease (but not all)
4. Exhaust fan pulls air through ductwork
5. Ductwork carries air to roof
6. Upblast exhaust fan discharges air outside

Where grease accumulates:

• Hood interior: Constant exposure to grease vapors
• Grease filters: Designed to capture but need regular cleaning
• Ductwork: Grease coats interior surfaces
• Exhaust fan: Fan blades and housing get coated
• Upblast fan: Roof discharge unit accumulates grease

Fire hazard:

Grease is highly flammable. Kitchen fires spread into exhaust systems, travel through ductwork, and burn from the inside out. These fires are intense, destructive, and dangerous.

NFPA 96 Standard:

NFPA 96 is the National Fire Protection Association standard for ventilation control and fire protection of commercial cooking operations. It sets requirements for:

• System design and installation
• Cleaning frequency based on cooking type and volume
• Cleaning methods and procedures
• Documentation and certification
• Inspection requirements

Compliance is mandatory, not optional. Fire inspectors inspect hoods and require documentation of proper cleaning by certified professionals.

Grease trap cleaning

Grease traps (or grease interceptors) capture grease and solids before they enter sewer systems. Different from hoods but related kitchen maintenance.

Frequency:

• High-volume (fast food, frying): Monthly
• Moderate volume: Quarterly
• Low volume: Semiannually

Process:

1. Access trap: Locate and open (usually outside or in kitchen floor)
2. Remove contents: Scoop out grease and solids
3. Clean interior: Scrub sides, bottom, baffles
4. Proper disposal: Grease goes to approved rendering facility or landfill
5. Document: Record cleaning, before/after photos, measurement of grease accumulation
6. Report: Provide property manager/owner with documentation

Challenges:

• Foul odor: Grease traps smell terrible
• Heavy lifting: Grease and solids are heavy
• Messy work: Can be sloppy
• Disposal regulations: Can’t just dump in trash or sewer
• Access issues: Some traps are difficult to reach

Pricing: $150-400 per cleaning depending on size and location.

Kitchen exhaust hood cleaning (NFPA 96)

WARNING: This work requires specific certification, training, and insurance. Do not attempt without proper credentials.

Certification requirements:

• Complete NFPA 96 training through approved program
• Pass examination on cleaning methods and standards
• Carry specific insurance for fire protection work ($1-2 million minimum)
• Maintain documentation of all cleanings
• Use proper equipment and methods per NFPA 96
• Provide certification stickers showing cleaning date and next due date

Cleaning frequency by cooking type:

Solid fuel (charbroilers, wood-burning): Monthly

High-volume cooking: Quarterly

Moderate-volume: Semiannually

Low-volume (soup, sandwiches): Annually

The cleaning process:

Preparation:

1. Shut down cooking equipment for safety
2. Protect kitchen area: Plastic sheeting, containment
3. Turn off exhaust fan and lockout/tagout electrical
4. Prepare chemicals: Degreaser designed for hood cleaning
5. Set up equipment: Pressure washer, scrapers, vacuums

Filter cleaning:

1. Remove filters from hood
2. Scrape off heavy grease
3. Soak in degreaser or pressure wash
4. Rinse thoroughly and let dry
5. Reinstall after hood is clean

Hood interior:

1. Scrape heavy grease from hood surfaces
2. Apply degreaser liberally
3. Let dwell per manufacturer directions (usually 15-30 minutes)
4. Agitate: Stiff brush or scrape as needed
5. Pressure wash: Hot water pressure wash to remove all grease
6. Wipe down: Remove all residue
7. Inspect: Ensure all grease is removed

Ductwork access:

1. Access doors: Open all access doors in ductwork
2. Scrape duct interior: Reach in with scrapers
3. Apply degreaser to duct surfaces
4. Pressure wash through access doors
5. Rotate/scrub fans: Fan blades get coated
6. Inspect thoroughly: Duct must be clean to access point

Exhaust fan:

1. Access fan: Usually on roof or in ceiling space
2. Remove fan blades if accessible and necessary
3. Scrape housing: Remove all grease buildup
4. Clean blades: All surfaces must be grease-free
5. Inspect belt and motor: Check wear, lubrication
6. Reassemble and test operation

Upblast fan (roof unit):

1. Access roof unit: Fall protection required
2. Remove fan cover: To access blades
3. Clean all surfaces: Housing, blades, discharge area
4. Check damper operation: Ensures proper backdraft prevention
5. Inspect roof area: Grease on roof is fire hazard

Documentation (CRITICAL):

• Before photos: Show pre-cleaning condition
• After photos: Show clean surfaces
• Cleaning report: Details of what was cleaned, methods used
• Certification sticker: Applied to hood showing cleaning date and next due
• Invoice and proof of service: For fire inspector records

Equipment needed:

• Hot water pressure washer: 3,000-4,000 PSI, 4+ GPM
• Chemical injector: For applying degreaser
• Scrapers and brushes: Various sizes and shapes
• Extension wands: For reaching ductwork
• Wet vac: For containing dirty water
• Fall protection: For roof work
• Lockout/tagout kit: For electrical safety
• Containment: Tarps, plastic sheeting
• Protective equipment: Chemical-resistant gloves, eye protection, respirator

Chemicals:

• Heavy-duty degreaser: Designed specifically for kitchen grease
• Caustic cleaners: Often necessary for heavy buildup (handle with extreme care)
• Neutralizers: After caustic cleaners
• Only use chemicals approved for hood cleaning per NFPA 96

Pricing hood cleaning

Hood cleaning prices vary by system size, complexity, and frequency.

Typical pricing:

• Small system (single hood, short duct): $250-400 per cleaning
• Medium system (multiple hoods, moderate ductwork): $400-700 per cleaning
• Large system (extensive ductwork, roof units): $700-1,500+ per cleaning

Quarterly contracts: 10-15% discount from one-time pricing.

Factors affecting price:

• Number of hoods
• Ductwork length and complexity
• Access difficulty (roof work, high ceilings)
• Grease accumulation (heavier = harder)
• Cooking type (solid fuel requires more work)
• System size (larger fans, longer ducts)

Example:

Restaurant with 2 hoods, 15 feet of ductwork, roof upblast fan:

• Quarterly cleaning: $450 per visit
• Annual total: $1,800
• Takes 2-3 hours once experienced

The business model

Landing hood cleaning accounts:

Restaurants need this service. It’s not optional; it’s a fire code requirement.

Approach: “I’m NFPA 96 certified for kitchen exhaust cleaning. I provide thorough cleaning, proper documentation, and certification stickers to keep you compliant with fire code. Let me inspect your system and provide a quote.”

Your value proposition:

• NFPA 96 certified: Trained and compliant
• Proper documentation: Fire inspectors require proof
• Thorough cleaning: Don’t cut corners
• Reliability: Shows up when scheduled
• Insurance: Proper coverage for fire protection work

Target clients:

• Independent restaurants: Need reliable service
• Restaurant groups: Multiple locations
• Institutional kitchens: Schools, hospitals, hotels
• Food service contractors: Large-scale operations

Contract terms:

• Duration: 12 months minimum (fire code requires regular cleaning)
• Frequency: Based on cooking type (monthly, quarterly, semiannually)
• Payment: Net 15-30
• Scope: Exactly what’s included each visit
• Documentation: Photos, reports, stickers provided
• Emergency access: Available for fire inspector requests

Managing relationships:

• Consistency: Same quality, every time
• Documentation: Fire inspectors want to see records
• Communication: Notify of any issues found (system problems, wear)
• Flexibility: Sometimes cleaning must work around restaurant schedule
• Professionalism: Clean, uniformed, respectful of kitchen operations

Common challenges

Grease accumulation: Some kitchens produce massive grease. Takes longer, more chemicals.

Access issues: Ductwork with few access doors, roof units, high ceilings.

Kitchen operations: Must work around restaurant schedule, often nights or early mornings.

Roof work: Fall protection, weather, roof access challenges.

Grease filters: Often missing or damaged. Recommend replacements.

System modifications: Restaurants modify systems without proper engineering. Creates cleaning problems.

Fire inspections: Restaurant calls with last-minute notice before inspection. Emergency work.

Safety and liability

Hood cleaning has serious hazards:

• Fire hazard: Grease is highly flammable. No open flames, sparks during cleaning.
• Chemical exposure: Degreasers are caustic and toxic. Proper PPE mandatory.
• Working at height: Roof units require fall protection.
• Electrical hazards: Lockout/tagout required.
• Confined spaces: Some ductwork is tight.
• Hot surfaces: Equipment may still be hot from cooking.
• Slip hazards: Grease makes everything slippery.

Insurance requirements:

• General liability: $1-2 million minimum
• Professional liability: Errors and omissions
• Workers compensation: If you have employees
• Umbrella policy: Additional liability protection

Legal requirements:

• NFPA 96 certification: Mandatory, not optional
• Business licenses: Local and state
• Fire department permits: Some jurisdictions require
• Waste disposal: Grease must go to approved facility

Getting certified

If you want to offer hood cleaning:

1. Complete NFPA 96 training: Multiple organizations offer certification programs
2. Pass examination: Written and sometimes practical
3. Obtain insurance: Specific to fire protection work
4. Purchase equipment: Proper tools for the job
5. Practice: Work with experienced cleaner before going solo
6. Maintain certification: Continuing education, recertification

Training organizations:

• IKACHI (International Kitchen Exhaust Cleaning & Hood Inspection Association)
• Power Washers of North America (PWNA)
• Various manufacturers: Offer training on their products
• Local fire protection companies: Sometimes offer training

This is not DIY-able. Get proper training and certification or refer to professionals.

Complementary services

Once established in hood cleaning, expand:

• Grease trap cleaning: Natural add-on service
• Kitchen deep cleaning: Behind equipment, under line, etc.
• Filter replacement: Sell and install grease filters
• Ductwork modification: Add access doors for better cleaning (if qualified)
• Fire suppression system inspection: Coordinate with fire protection company
• Restaurant exterior cleaning: Natural connection

The bottom line

Kitchen exhaust hood cleaning is technical, regulated work with serious liability if done wrong. It’s also highly profitable, protected from competition, and required by fire code for every restaurant.

Most restaurants need quarterly service, which means recurring revenue from each account. The work requires proper training, certification, and respect for the fire protection side. There’s no room for shortcuts.

If you’re willing to get certified, learn the proper methods, and maintain high standards, hood cleaning is a stable, profitable niche that most pressure washers can’t touch.

If you’re not certified, refer this work to professionals. It’s the right call for client safety and your own liability protection.