Kitchen Exhaust Cleaning in Kanata
Kitchen exhaust cleaning is everything downstream of the hood: the horizontal duct above the ceiling, every elbow and transition along it, the vertical riser, and the fan sitting on the roof. Kanata Hood Cleaning Pros opens each section through its own access point, cleans it, and photographs it individually, then hinges the rooftop fan back and cleans the housing, blades, curb and drain. Kitchen exhaust cleaning services across Kanata, Stittsville, Carp and Richmond are quoted alongside the hood, because cleaning either one alone does not hold.
Grease travels, and it stops where the air slows down
Which is why the duct load is never evenly spread, and why the worst of it sits at the three points hardest to open.
Air leaves a cook line hot and loaded with vapour. As it travels the duct it cools, and cooling is the moment vapour becomes deposit. Where it cools fastest and moves slowest is where the deposit lands.
That gives you three predictable trouble spots. The first elbow after the hood collar, where the airstream slams into a change of direction and drops its load. Any transition where the duct changes size, because a size change is a velocity change. And the base of the vertical riser, where horizontal flow has to turn upward and gravity starts pulling the heavier deposits back down.
All three are above a ceiling, inside a chase, or behind a wall. A system can therefore pass a visual check from the kitchen and still be carrying its entire fuel load fifteen feet away, which is the gap this part of the work exists to close.
Access panels are the difference between a cleaned duct and a guessed one
You cannot clean what you cannot open, and a great many Kanata systems were installed without enough openings to clean them properly.
NFPA 96 expects the duct system to be reachable along its whole length, with access at each change of direction and at intervals along straight runs. Plenty of buildings were fitted out to a budget instead, with a single opening at the hood collar and nothing after it. The honest options at that point are two: cut in compliant access panels, or write on the certificate that the run was not reached.
Access panels are fitted with a gasketed, grease-tight cover rated for the duct they sit in, positioned so the section either side can actually be worked, and marked so the next technician finds them without hunting. They are a one-time cost that makes every future cleaning cheaper and every future certificate honest. The alternative, which several systems in this area are currently living with, is paying for a duct cleaning that physically cannot have happened.
Where a panel cannot be fitted because of structure or fire separation, it goes on the certificate as an unreached section with the reason. An inspector would far rather read that line than not find it.
The rooftop fan, and why Kanata roofs are their own problem
The part of the system nobody in the kitchen has ever seen, on buildings that spend four months under snow.
The exhaust fan is the terminus of the whole path. It runs continuously through service, its blades collect a heavy unbalanced coating, and the housing beneath it catches everything that condenses out. Left alone, the deposit does three things: it loads the blades until the fan drops airflow and the kitchen starts smoking back, it hardens around the shaft and bearings, and it overflows the curb onto the roof membrane.
That last one is a building problem rather than a fire problem, and it is expensive. Grease degrades roofing membrane. On the flat-roofed retail, office and light-industrial stock that makes up most of Kanata's commercial buildings, a fan that has been overflowing for years leaves a stain that the landlord will eventually charge someone for. A grease containment system at the curb is a small fitting that prevents it entirely.
The fan work itself is straightforward: isolate the power, hinge the fan back on its kit, clean the housing, blades, curb and drain path, check the belt and bearings while everything is open, and return it. The complication in this climate is access. Between roughly December and March a Kanata roof may be under snow, iced at the hatch, or simply unsafe in wind. Winter visits get an access plan agreed with the building before the crew is dispatched, and if the roof cannot be worked safely the fan section is deferred and the certificate says so rather than pretending otherwise.
If the fan has no hinge kit, it has to be unbolted and lifted to clean underneath, which adds time to every single visit. Fitting a hinge kit once pays for itself quickly on any kitchen cleaning quarterly.
What gets cleaned, section by section
| Section | Why it matters | How it is reached |
|---|---|---|
| Duct collar | First point past the filters, and the transition where deposit begins | Through the hood with the filters removed |
| First elbow | Heaviest single deposit in most systems, from the sudden direction change | Access panel at the bend, cut in where none exists |
| Horizontal run | Long cooling path where vapour turns to deposit across the full length | Panels at intervals along the run, worked in both directions |
| Transitions | Every size change is a velocity change, so every one collects | Panel at each transition |
| Vertical riser | Deposit slides back down and builds at the base over years | Panel at the base, plus top-down work from the fan opening |
| Fan housing and blades | Loaded blades cut airflow and push smoke back into the kitchen | Fan hinged back on the roof, power isolated first |
| Curb and drain | Overflow damages the roof membrane and becomes a landlord dispute | At the fan base, with containment fitted where needed |
The hood, filters and plenum at the top of that path are covered on the commercial hood cleaning page.
Signs your duct is overdue before anyone opens it
The system usually tells you. These are the four complaints that turn out to be duct loading almost every time.
The kitchen is smoking back
Vapour rolling out from under the canopy instead of being drawn up means the system has lost airflow. Loaded fan blades and a restricted duct are the usual cause, well before anyone suspects the fan motor.
Drips at the hood or the ceiling
Liquid grease appearing at a seam or a ceiling tile means the duct is holding more than it can carry and has found a joint to leak from. That is a same-week call, not a next-quarter one.
Smell in the dining room or the corridor
In a multi-tenant building at Kanata Centrum or a mall food court, a loaded duct pushes odour into shared space, and the complaint usually reaches the landlord before it reaches you.
A stain spreading on the roof
Visible discolouration around the fan curb means the containment is absent or full. Every month it continues is membrane damage, and the repair bill lands with whoever holds the lease.
Frequently asked questions
What is the difference between hood cleaning and kitchen exhaust cleaning?
Hood cleaning refers to the part inside the kitchen: canopy, filters, trough and plenum. Kitchen exhaust cleaning refers to the full system, including the duct run above the ceiling, the vertical riser and the rooftop fan. NFPA 96 addresses the whole path, so a cleaning limited to the hood does not satisfy the standard. In practice the two are quoted and performed together on the same visit.
What if my duct has no access panels?
Compliant access panels are cut in as part of the work, sized and gasketed for the duct they sit in and marked for the next technician. It is a one-time cost that makes every subsequent cleaning faster. Where a panel genuinely cannot be fitted because of structure or a fire separation, the section is recorded on the certificate as unreached, with the reason stated.
Do you clean the rooftop fan in winter?
Yes, when the roof can be worked safely. Access is agreed with the building before the crew is dispatched, covering the hatch or ladder route, snow clearing and the weather window. If conditions make the roof unsafe on the day, the fan section is deferred to a follow-up visit and the certificate records it rather than showing work that did not happen.
How long does exhaust cleaning take on top of the hood?
On a single-hood kitchen with reasonable access, the duct and fan add roughly two to three hours to the visit. A long horizontal run, a tall riser or a fan with no hinge kit adds more. First visits where panels have to be cut in are longer again, and that is quoted separately so there is no surprise on the invoice.
Who is responsible for the duct in a leased unit?
It depends on the lease, and it is worth reading before you need the answer. In multi-tenant buildings the hood and the duct inside your unit are commonly the tenant's responsibility while the shared riser and the rooftop fan sit with the landlord. Split responsibility is the most common reason a system ends up half cleaned for years, so the walk-through identifies where the boundary falls before any work is quoted.