A professional kitchen exhaust system cleaning goes far beyond wiping down the visible stainless steel. A complete service includes the accessible hood surfaces, grease filters, plenum areas, ductwork, exhaust fan housing and blades, grease collection components, and the related parts that carry cooking fumes out of the building. For commercial kitchens in the Lower Mainland, understanding what is included in hood cleaning matters because grease buildup inside an exhaust system is one of the most serious fire hazards a restaurant can face. A small flare-up on the cook line can spread quickly through the entire system if grease has collected in the ductwork and fan. This article explains the full component checklist, what counts as standard work, what is conditional, what happens with inaccessible areas, and what documentation you should receive after the service.
Before comparing service quotes, use the table below as a quick reference. It lists the main components of a commercial kitchen exhaust system and what a professional cleaning should cover.
| Component | What a professional cleaning covers | Why it matters |
| Hood surfaces | Degreasing of accessible interior and exterior surfaces | A spotless exterior can hide grease deeper in the system |
| Grease filters | Deep cleaning or replacement | Filters capture the first layer of airborne grease |
| Plenum | Scraped and washed | The cavity above the filters where grease collects before the duct |
| Ductwork | Scraped and washed; access panels opened for interior cleaning | Grease in ducts can act as a fuel source |
| Access panels | Opened, cleaned, and updated with inspection stickers | Panels make deep cleaning possible |
| Rooftop fan | Housing, blades, and grease drip trays cleaned; belts checked | The final point where grease exits the building |
What Is Included in Hood Cleaning
What is included in hood cleaning depends on the provider you hire. Some companies focus on the hood and filters only, while others clean the full route from hood to rooftop fan. The second approach is the one that protects a commercial kitchen. The visible hood is only the starting point. After the hood, the system continues through the plenum, horizontal and vertical ductwork, access panels, fan housing, fan blades, and grease collection components. If any of those areas are skipped, grease remains in the system, and the fire risk stays with it.
The Full System Route: From Hood to Rooftop Fan
A thorough commercial exhaust cleaning follows the path that air takes leaving the kitchen. Each part of that path has a specific role, and each one needs a specific cleaning method. Here is the component-by-component breakdown.
Hood Surfaces and Grease Filters
The work starts at the hood, the large metal canopy above the cooking equipment. Professional cleaning includes full hood degreasing: stripping away grease and grime that standard wiping misses. Grease filters are part of this step. Filters are either deep cleaned or replaced, depending on their condition. Since filters capture grease before it can travel further into the system, they need to be handled carefully so they continue working properly.
Plenum
The plenum is the space between the filters and the ductwork. Grease-laden air passes through this cavity on its way up and out of the building. Over time, grease accumulates on the plenum walls and ceiling. A complete cleaning includes scraping and washing these surfaces. The plenum is easy to overlook because it is hidden above the hood, but it sits directly in the path of the exhaust airflow.
Ducts and Access Panels
Ductwork carries the grease-laden air from the plenum to the rooftop fan. Horizontal ductwork is scraped and washed, and access panels are opened for deep interior cleaning. Access panels, sometimes called clean outs, are openings in the duct that allow technicians to reach surfaces that would otherwise be impossible to clean. Roof fans and ducts cannot be cleaned efficiently without a hinge kit or duct access door. Some buildings already have access panels installed; others may need them added. A provider that asks how many access panels your ductwork has before giving a price estimate is usually one that understands the job.
Rooftop Fan and Grease Collection Components
The last point on the route is the rooftop fan. A comprehensive cleaning includes the fan housing, fan blades, and grease drip trays. The service also includes checks for belts and other components that affect fan performance. The rooftop fan is often exposed to the elements, and grease can harden on the blades and housing, making the fan heavier and less efficient. Cleaning this component is part of the full system route, not an optional add-on.
Standard Inclusions vs. Conditional Work
Some parts of an exhaust cleaning are standard on every job. Accessible hood surfaces, grease filters, plenum areas, ductwork, fan housing and blades, and grease collection components are the usual scope. Other work is conditional. Access panel installation, for example, is not always part of a cleaning. If the ductwork does not have enough access points, the technician may recommend installing them so the interior of the duct can be cleaned properly. Filter replacement, belt replacement, and mechanical repairs also fall into conditional work. These are not cleaning tasks; they are parts or repairs that depend on what the technician finds on site. A clear quote should separate standard cleaning from conditional work.
Inaccessible Areas: What Happens Then
Not every part of an exhaust system can be reached on the first visit. Duct runs that are long, twisted, or installed without access doors may have sections that cannot be cleaned efficiently. This is where the condition of the building matters. If a duct section is inaccessible, the technician should tell you, explain why, and recommend a solution, which often involves installing an access panel. Some providers will not mention skipped areas unless asked. A professional service documents what was cleaned and what was not, so you know the exact condition of the system when the job is done.
Documentation and Post-Service Handoff
A professional kitchen exhaust cleaning should leave you with more than a clean system. You should also receive documentation of the work performed. This typically confirms that the hoods, filters, plenum, ductwork, access panels, and rooftop exhaust fans were serviced. Access panels should display updated inspection stickers after the service. That documentation supports fire code compliance and gives you a record for inspectors, insurance purposes, and future maintenance planning. If a provider cannot describe what will be documented before the job starts, ask for that information up front.
Cleaning, Inspection, or Maintenance: Where the Line Falls
It helps to understand the boundary between cleaning, inspection, maintenance, and mechanical work. Cleaning removes grease from the surfaces in the exhaust path. Inspection is the technician’s visual assessment of the system’s condition during the cleaning visit. Maintenance includes tasks like checking belts on the rooftop fan and verifying that components are intact. Mechanical work, such as replacing a worn belt, repairing a fan motor, or adding access panels, goes beyond the cleaning scope and is usually quoted separately. The service also helps support NFPA 96 compliance, and providers who follow that standard typically document their work. For the exact requirements that apply to your facility, confirm details with the authority having jurisdiction in your area.
Hood-Only Cleaning vs. Full Exhaust System Cleaning
For a restaurant or café, the practical difference between hood-only cleaning and full system cleaning is significant. The visible hood can look spotless while grease remains deeper in the plenum, ducts, and fan. For commercial kitchens in the Lower Mainland, booking kitchen exhaust system cleaning for restaurants that covers the full route is the more complete approach. When you compare providers, ask which components are in the quote, whether access panels are included, and what documentation you will receive.
Visual Reference: Annotated System Diagram and Checklist
A picture of the exhaust route makes the scope easier to understand. This article should carry an annotated system diagram and a printed checklist that technicians can use before and after each service. The diagram would label the hood, filters, plenum, ducts, access panels, and rooftop fan. The checklist would confirm each area was cleaned and documented.
[Unavailable evidence: annotated system diagram and checklist. Larsa Vent Cleaning should supply a labeled diagram of a typical commercial exhaust system and a service checklist before publication.]
Frequently Asked Questions
How often should a commercial kitchen exhaust system be cleaned?
Frequency depends on cooking volume, the type of food being prepared, and the requirements of your local fire authority. A high-output kitchen that produces heavy grease will need service more often than a light-duty operation. The authority having jurisdiction sets the schedule for your facility, so confirm the interval with them and keep your cleaning documentation on file.
Why do access panels matter for duct cleaning?
Access panels, sometimes called clean outs, are openings in the ductwork that allow technicians to reach the interior of the duct. Without them, roof fans and ducts cannot be cleaned efficiently, and grease can remain inside the system. Access panels also help the fan stay cleaner, work more efficiently, and reduce the risk of fire. If your system lacks panels, a professional can install them.
Is filter replacement included in a standard hood cleaning?
Grease filters are part of the standard scope, and a professional will deep clean them or recommend replacement based on their condition. Replacement is conditional work because it depends on what the technician finds on site. Some filters can be restored, while others are too damaged or saturated to be safely reused. Ask your provider how filter condition is handled in the quote.
What documentation should I receive after an exhaust cleaning?
You should receive a record confirming that the hood, filters, plenum, ductwork, access panels, and rooftop fan were serviced. Access panels should display updated inspection stickers after the service. This documentation helps support fire code compliance and gives you a clear record for inspectors and for planning the next scheduled cleaning. Ask for the document format before you book.
Choosing a provider comes down to scope, not just price. Compare scope and request a quote with a company that cleans the full route from hood to rooftop fan, explains conditional work clearly, and provides documentation after every visit. For a commercial kitchen in the Lower Mainland, that level of clarity makes the difference between a clean-looking hood and a genuinely clean exhaust system.