How do I clean my kitchen hood vents?

Kitchen staff should remove the stainless steel baffle filters daily and wash them in a commercial dish machine or a three compartment sink. Staff can wipe down the accessible hood canopy but should never spray water directly into the ductwork.

Can a restaurant owner clean their own hood ducting?

No. NFPA 96 requires certified professionals to clean the inaccessible ductwork and exhaust fan to a bare metal standard. Restaurant owners lack the 3000 PSI hot water equipment and chemical expertise required to pass a fire marshal inspection.

How much does commercial hood cleaning cost?

A standard professional hood cleaning costs between 400 and 800 USD. The exact price depends on the total length of the ductwork, the size of the hood canopy, and the severity of the grease buildup.

How to Clean Restaurant Exhaust Ducting: NFPA 96 Guide

Q: How often should restaurant hood vents be cleaned?

NFPA 96 Table 11.4 dictates cleaning frequencies based on cooking volume. Solid fuel operations require monthly cleaning. High volume kitchens need quarterly service. Moderate volume restaurants require semiannual cleaning, and low volume facilities like churches need annual service.

Q: What is the best degreaser for cleaning kitchen hood vents?

Professional hood cleaners use caustic degreasers formulated with sodium hydroxide (lye) or potassium hydroxide. These heavy duty chemicals melt polymerized grease but require strict safety protocols and personal protective equipment to prevent severe skin burns.

Q: What do professional hood cleaners use?

Certified technicians use hot water pressure washers capable of 3000 PSI and 200 degrees Fahrenheit. They also utilize heavy duty plastic sheeting, magnets to funnel wastewater, and highly caustic chemical degreasers to achieve the NFPA 96 bare metal standard.

Learn how to clean restaurant exhaust ducting to NFPA 96 bare metal standards. Discover required equipment, caustic chemicals, and compliance steps.

General guidance only, not legal or compliance advice. Requirements vary by state, city, and Authority Having Jurisdiction. Verify with your local fire marshal or health department before acting. See the full disclaimer at the end of this article.

Can a restaurant owner clean their own exhaust ducting, or does NFPA 96 require a certified professional? Kitchen staff can clean the accessible hood canopies and baffle filters during daily closing duties.

NFPA 96 requires certified professionals to clean the inaccessible ductwork and the exhaust fan to a bare metal standard. A standard kitchen crew lacks the 3000 PSI hot water pressure washers and caustic chemicals needed to melt polymerized grease inside vertical duct drops. Relying on staff for deep cleaning will result in failed fire marshal inspections and denied insurance claims.

NFPA 96 Requirements for Exhaust Duct Cleaning

Strict legal standards govern commercial hood cleaning compliance. According to NFPA 96 Section 11.6.1, the entire exhaust system must be cleaned to a bare metal standard. Zero grease residue can remain on the hood, the ductwork, or the exhaust fan blades. Scraping the surface grease is not enough to pass an inspection.

The local Authority Having Jurisdiction (AHJ) has the final say on your compliance status. The AHJ will look for a valid certification sticker placed directly on the hood canopy after every service. Operators must hire technicians who understand commercial kitchen hood cleaning code requirements. Those technicians must provide a detailed post-service photo report proving the bare metal condition.

How often should restaurant hood vents be cleaned?

Mandatory inspection and cleaning frequencies depend entirely on your cooking volume and fuel type. You must follow the exact intervals outlined in NFPA 96 Table 11.4 to maintain fire safety compliance. Ignoring these timelines will void your insurance policy.

Cooking Volume / Type	NFPA 96 Cleaning Frequency	Typical Facility Types
Solid Fuel Cooking	Monthly	Wood-fired pizza ovens, charcoal grills
High Volume	Quarterly	24-hour diners, fast food, charbroiling
Moderate Volume	Semiannually	Standard sit-down restaurants, cafeterias
Low Volume	Annually	Churches, daycares, seasonal camps

If you run a 24-hour diner or rely heavily on charbroilers, you fall into the high-volume category and require quarterly service. Standard restaurants need semiannual service. You can learn more about scheduling in our guide on how often restaurant hoods need to be cleaned.

What do professional hood cleaners use?

Bare metal takes heavy-duty industrial equipment. Technicians use hot water pressure washers capable of reaching 3000 PSI and water temperatures of at least 200 degrees Fahrenheit. Cold water will simply push grease around. It completely fails to remove baked-on polymerized grease.

Crews deploy heavy-duty plastic sheeting and specialized magnets to protect the kitchen during service. This setup creates a funnel that directs wastewater down from the hood canopy into a collection barrel. Proper commercial hood cleaning equipment keeps the massive volume of greasy wastewater off your cooking appliances and floor.

Step-by-Step Guide to Cleaning Commercial Hood Stacks and Ducts

Rooftop upblast exhaust fan tilted open for ductwork cleaning and inspection

Technicians begin on the roof. They apply chemical degreaser to the upblast exhaust fan and the vertical duct drop. The chemicals must dwell for 15 to 20 minutes to break down the carbonized buildup.

During this time, technicians check for specific failure modes. They look for leaking duct seams, broken exhaust fan hinges, compromised fusible links, and clogged fire suppression nozzles. After the dwell time, they pressure wash the ductwork from the top down. The process generates 50 to 100 gallons of wastewater, which is captured at the bottom of the plastic funnel system.

Daily Staff Maintenance: Baffle Filters and Canopies

Restaurant staff must handle daily and weekly maintenance to keep the system functioning between professional cleanings. This routine maintenance focuses strictly on the removal and cleaning of baffle filters. Staff should run the stainless steel baffle filters through a commercial dish machine or soak them in a three-compartment sink using mild degreasers.

Never allow staff to spray water directly up into the ductwork. Spraying hoses into the hood canopy can easily damage the fire suppression system or trigger a catastrophic grease fire. Staff should only wipe down the accessible interior stainless steel surfaces of the canopy with a rag and standard kitchen cleaner.

What is the best degreaser for cleaning kitchen hood vents?

The commercial hood cleaning industry relies on highly caustic chemicals to melt grease. Sodium hydroxide (lye) and potassium hydroxide are the active ingredients in professional-grade hood cleaners. These chemicals saponify the grease, turning it into a soapy substance that easily washes away under high pressure.

A 5-gallon bucket of professional-grade caustic degreaser typically costs between 50 and 150 USD. These commercial hood cleaning chemicals are highly corrosive, so technicians must wear heavy personal protective equipment. The Occupational Safety and Health Administration (OSHA) mandates the use of face shields, chemical-resistant gloves, and waterproof suits to prevent severe skin burns.

How to clean kitchen exhaust fan grease without removing it

Upblast exhaust fans must be tilted back on their hinges to access the fan blades and the vertical duct below. If the fan lacks hinges, they must be installed immediately to comply with fire codes.

Once tilted, technicians use specialized scrapers to remove heavy buildup from the fan bowl before applying chemicals. A rooftop grease containment box is an absolute necessity during this process. Without a proper containment system, greasy runoff will destroy the roof membrane and violate Environmental Protection Agency (EPA) wastewater regulations.

Hiring a Hood Cleaning Service Near Me

When hiring a contractor, restaurant owners must verify the company holds certifications from recognized agencies like IKECA, Phil Ackland (PAC), or MFS, as required by the local AHJ. An average professional restaurant hood cleaning costs between 400 and 800 USD. This price fluctuates depending on the system size, the length of the ductwork, and the current grease load.

A reputable company will always provide a comprehensive post-service photo report. This document must clearly show the bare metal condition of the hood canopy, the entire run of ductwork, and the upblast exhaust fan. Do not pay the invoice until this photographic evidence proves your facility meets strict NFPA 96 fire safety standards.

How to Clean Restaurant Exhaust Ducting (NFPA 96 Guide)

Generate an NFPA 96 hood cleaning certificate in 60 seconds