Kitchen Exhaust Cleaning in Toronto
Kitchen exhaust cleaning is the cleaning of the complete path that carries cooking exhaust out of a building: the hood and its filters, the ductwork with every elbow and vertical section, the access panels that open that ductwork, the exhaust fan, and the rooftop area around the discharge. Hood Cleaning Toronto cleans each section to bare metal and names it on a signed certificate referencing the published NFPA 96 standard, because the hood a cook can see is only a fraction of the system, and a fire does not stop at the duct collar.
The hood is a fraction of the system: what the rest looks like
A kitchen exhaust system has five zones, and four of them are invisible from the cook line.
Behind the filters, grease-laden air enters the duct. Ducts in Toronto kitchens run horizontally through ceiling spaces, turn through elbows, and climb vertical sections toward the roof. Grease condenses on the duct interior as the air cools, and it collects heaviest where the airflow changes: the outer curve of each elbow, the flat bottom of horizontal sections, and the base of vertical climbs where softened grease drains back down and pools.
Access panels are the sealed, removable openings that make those duct sections reachable. A duct without panels within reach of every section cannot be cleaned, only wiped at each end. Hood Cleaning Toronto opens every existing panel, resets each one with a fresh grease-tight seal, and flags any blind section in writing so the record shows what was reached and what needs a panel before it can be.
At the top of the run sits the exhaust fan. Grease coats the fan blades and housing, throws the fan out of balance, and drains down the fan base onto the roof. The rooftop around the discharge collects everything the fan expels, and grease standing on a roof membrane is both a fire fuel and a roof damage problem the building owner ends up holding.
The hood assembly itself, and the 8 step process it gets cleaned with, is covered in detail on the commercial hood cleaning page. This page is about everything past the collar.
Hood-only wipe-down vs full exhaust system clean
Both produce a shiny canopy. Only one of them removes the fuel a duct fire runs on.
| System zone | Hood-only wipe-down | Full exhaust system clean |
|---|---|---|
| Hood, filters, plenum | Cleaned. This is the whole job. | Cleaned first, then the crew follows the grease upstream. |
| Duct interior and elbows | Untouched behind the collar. | Opened at each access panel and scraped and degreased to bare metal. |
| Vertical duct sections | Not reached, including the grease pooled at the base. | Cleaned top to bottom, pooled grease at the base removed. |
| Access panels | Rarely opened, never resealed. | Every panel opened, cleaned, and resealed grease-tight; blind sections flagged in writing. |
| Exhaust fan and rooftop | Out of scope. | Fan blades and housing degreased, rooftop discharge area cleaned of standing grease. |
| Documentation | An invoice naming a hood. | Photos and a signed NFPA 96 referenced certificate naming every section cleaned. |
Not sure which your last contractor delivered? Check the paperwork: if the certificate does not name duct sections and the fan, they were not in the scope.
Where does grease hide in a Toronto kitchen exhaust system?
Grease hides wherever the exhaust air slows down or changes direction: elbow curves, horizontal duct bottoms, the base of vertical sections, fan blades, and the roof around the discharge.
Toronto buildings add their own wrinkles. Older downtown storefronts often run short, steep ducts to a flat roof with a single panel at the collar, so the middle of the run has never been opened. Kitchens on the ground floor of larger buildings can have long horizontal runs threaded through ceiling spaces shared with other tenants, where a slow grease drip goes unnoticed until it stains a ceiling tile two units over. The first visit maps the actual route of the duct, records where the panels are, and turns an invisible system into a documented one.
What does cleaned to bare metal mean? It means the surface is scraped and degreased until the metal itself shows, not until the surface looks dark and even. Grease burned onto a duct wall carbonizes and darkens, and a wipe that leaves a smooth black film has left the fuel in place. Bare metal is the standard the photographs have to show, which is why every section gets a before-and-after pair.
How much does kitchen exhaust cleaning cost in Toronto?
Hood Cleaning Toronto prices single-hood systems from $385 per visit and multi-hood systems from $725 per visit, and the full breakdown of what moves the number sits on the hood cleaning cost guide.
Duct length, panel count, fan access, and roof access all shape the quote, which is why larger and multi-site systems get a written site-specific quote after the system is seen. How often the full system needs cleaning depends on cooking volume under the published NFPA 96 categories, and the complete frequency table is on the regulations and NFPA 96 guide.
High-volume operations like the ones on the restaurant hood cleaning page and multi-hood venues covered on the banquet hall page are exactly the kitchens where full-system cleaning earns its cost, because their ducts load fastest.
Kitchen exhaust cleaning in Toronto: frequently asked questions
How do duct access panels work during a cleaning?
Access panels are sealed, removable plates in the duct wall. The crew removes each panel, cleans the duct section it serves, photographs the result, and reseals the panel with a fresh grease-tight gasket so it holds vapour but opens again at the next service. A duct section with no panel in reach is flagged in the report as not accessible rather than quietly skipped.
Is the rooftop part of a kitchen exhaust cleaning?
Yes. Hood Cleaning Toronto includes the exhaust fan and the rooftop area around the discharge in a full-system clean, because that is where everything the fan expels ends up. Grease standing on a roof membrane damages the roof and remains a fire fuel, so the fan housing, blades, and the surrounding discharge area are degreased and photographed like every other section.
How does the crew get into the duct without cutting the ceiling?
Through the existing access panels, from the hood collar below, and from the fan opening above. Where a section of duct genuinely has no reachable opening, the report says so and recommends where a code-compliant panel should be added, priced in writing before any cutting happens. Nothing gets cut into a Toronto ceiling or duct as a surprise.
Will overnight duct cleaning disturb the neighbours upstairs?
The noisy portion is short and mostly mechanical scraping and water flow rather than machinery. Hood Cleaning Toronto schedules the loudest work for the earliest part of an overnight window and coordinates timing with building management where a kitchen sits under residential floors, which is a common arrangement in mixed-use Toronto buildings.
Can the kitchen cook the morning after a full system clean?
Yes. The system is reassembled, power and gas are restored, the fan is run and checked, and the line is left ready for morning prep. The visit is scheduled so the crew is finished, packed, and gone with the certificate and photos delivered before the first cook badges in.