Choosing a commercial kitchen exhaust canopy is one of the earliest — and least reversible — decisions in a kitchen fit-out. Get it right and the cookline falls into place around it; get it wrong and you inherit poor capture, trapped heat over the pass, or roof work you didn't budget for. This guide covers canopy selection for restaurant and café fit-outs: ducted vs ductless exhaust canopy solutions, wall versus island styles, sizing principles, makeup air, and the filter routine that keeps the system safe. For the regulatory side, read this alongside our complete guide to commercial kitchen ventilation — this article is about choosing the right canopy, not the compliance paperwork.
What a Commercial Kitchen Exhaust Canopy Actually Does
A commercial kitchen exhaust canopy sits over the cookline and does three jobs at once. First, capture: hot, contaminated air rises off fryers, grills, ovens and cooktops in a thermal plume, and the canopy's job is to intercept that plume before it escapes into the room. Second, filtration: airborne grease-laden vapour passes through filters (typically stainless baffle filters in ducted systems) that strip out grease particles before they coat the ductwork or fan. Third, removal or recirculation: the cleaned airstream is either ducted out of the building entirely, or — in a ductless exhaust canopy — passed through additional filter stages and returned to the room. You'll see the same equipment sold as a commercial exhaust hood, kitchen hood or exhaust canopy — the terms are used interchangeably.
Why it matters commercially: a kitchen without effective extraction runs hotter, staff fatigue faster, grease settles on every surface, odours drift into the dining room, and ceiling-space fire risk climbs. Good extraction does the opposite — it improves air quality and keeps the kitchen environment healthy and comfortable to work in through a full shift. In Australia, exhaust system design is generally assessed against Australian standards — AS 1668.2 in particular — and your local council or building certifier's requirements: the canopy is infrastructure, not a comfort item, and selection should happen alongside a conversation with a mechanical services contractor.
Ducted vs Ductless Commercial Kitchen Exhaust Canopy: How Each Works
Commercial exhaust canopies split into two families, and the first fork in the road is whether your canopy exhausts to outside air or recirculates filtered air back into the kitchen.
Ducted canopies are the conventional choice. The canopy hood captures the plume, baffle filters strip out the bulk of the grease, and a fan pushes the remaining air through rigid ductwork to a discharge point — usually at roof level, clear of air intakes. Because the contaminated air physically leaves the building, ducted systems handle heavy grease loads, high heat and large cooklines. Most units in our commercial exhaust canopy range are supplied as canopy shells, with the fan and duct run designed and fitted on site by a mechanical contractor to suit the building.
Ductless (filtered or recirculating) canopies take a different approach: instead of removing the air, they clean it. A typical ductless exhaust canopy pulls the plume through a multi-stage filter train — the filtration technology commonly combines a grease-capture stage, a fine particulate stage, and activated carbon to help eliminate odour — then discharges the treated air back into the room. There's no roof penetration, no external flue, and in many cases no makeup air system to design, which is exactly why they exist: they solve the sites where ducting is impossible.
| Factor | Ducted canopy | Ductless canopy |
|---|---|---|
| How air is handled | Extracted through ductwork and discharged outside the building | Filtered through multiple stages and recirculated into the room |
| Building works | Duct run, roof or wall penetration, external discharge point | Minimal — typically power supply and positioning only |
| Cooking duty suited | Full range, including heavy-grease and high-heat cooking (subject to design) | Light to medium duty; generally not suited to heavy solid-fuel or high-grease cooking |
| Makeup air | Required — extracted air must be replaced (see below) | Generally not required, as air is recirculated rather than removed |
| Heat removal | Removes heat from the kitchen along with the exhaust air | Limited — filtered air returns to the room, so heat largely stays |
| Ongoing costs | Filter cleaning plus periodic professional duct and fan cleaning | Filter cleaning plus scheduled replacement of carbon/particulate media |
| Relocation flexibility | Fixed — tied to the duct run | High — many units are freestanding or mobile |
| Approval pathway | Well-established under AS 1668.2 and council/certifier assessment | Site-specific — always confirm acceptance with your council or certifier first |
The honest summary: if your building allows a duct run and your menu involves serious frying, grilling or charring, a ducted commercial kitchen exhaust canopy remains the default answer. Ductless systems solve a specific problem — cooking where ducting can't go — rather than substituting like-for-like.
Where a Ductless Exhaust Canopy Makes Sense — and Where It Doesn't
Ductless canopies earn their keep in situations like these:
- Tenanted or heritage buildings where the landlord won't approve a roof penetration or a duct run is prohibitively expensive.
- Basement, arcade and mid-tower sites where the distance to a compliant discharge point rules out conventional ducting.
- Pop-ups, demonstration kitchens and training rooms where the cookline is temporary and the fit-out must leave no trace.
- Secondary cooking stations away from the main cookline that don't justify their own duct run.
- Mobile and flexible layouts — buffet cooking stations, function spaces — where the cooking position itself moves.
Their limits are just as important. Recirculated air returns most of its heat to the room — so they do little to reduce kitchen temperature — filter trains aren't designed for heavy-grease or solid-fuel cooking, and every unit carries a stated appliance capacity — exceed it and smoke escapes the capture zone. Council acceptance also varies, so treat "no ducting required" as an engineering fact, not an automatic approval, and confirm the pathway with your certifier before you order.
Commercial Exhaust Hood Styles: Wall-Mounted, Island and Mobile
Once you've settled the ducted-or-ductless question, canopy style follows the cookline layout.
Wall canopies are the workhorse. The cookline backs onto a wall, and the canopy mounts above it with the wall closing off one side of the capture zone. That's an aerodynamic advantage: the wall stops cross-draughts from one direction and helps funnel the plume upward into the hood, so wall canopies typically capture efficiently with less canopy area than an island unit over the same appliances. They also simplify the duct run, since the duct can rise directly behind or above the cookline.
Island canopies hang over a freestanding cookline that's open on all sides — the show-kitchen or back-to-back battery layout. Because the plume can drift in any direction and there's no wall to help contain it, island canopies need to be larger relative to the cookline beneath them, with more generous overhang on every side, and they're more sensitive to draughts from doors, passageways and air-conditioning outlets. They cost more to fabricate and install, but for open-plan and display kitchens they're the only way to put serious cooking in the middle of the room. If you're weighing up layouts, read this alongside our guide to the five types of commercial kitchen layouts — the canopy and layout decisions belong together.
Two other formats worth knowing: condensate canopies, designed for steam-heavy, low-grease appliances such as dishwashers and combi ovens; and modular canopy sections, which let you build a long cookline hood from linked one-metre units instead of a single custom fabrication — handy when the cookline may grow or site access is tight.
Kitchen Canopy Sizing: The Principles That Decide Capture
Kitchen canopy sizing is where most fit-out mistakes happen — nearly always a canopy sized to the appliances on the day, with no margin. Three principles drive it:
1. Overhang beyond the cook line. The thermal plume rising from an appliance doesn't go straight up — it expands as it rises and drifts with room air movement. The canopy therefore needs to extend past the cooking surface on every open side, so the plume is still under the hood by the time it reaches filter height. As indicative trade guidance, wall canopies overhang the front and both ends of the cookline, and island canopies overhang all four sides more generously. The exact overhang your kitchen requires is a design calculation, set by your mechanical designer against AS 1668.2 and your certifier's requirements — not read off a generic chart.
2. Height above the cooking surface. Mount the canopy too high and the expanding plume outgrows the canopy edge before it's captured; too low and it interferes with cooking and puts filters uncomfortably close to open flame. Commercial canopies sit within a fairly narrow band above the cooking surface — the specific figure comes from the mechanical design, and appliance manufacturers may impose their own minimum clearances.
3. Exhaust airflow matched to appliance duty. A canopy is only as good as the air the fan pulls through it. Heavier-duty cooking — chargrilling, wok cooking, high-volume frying — produces a stronger, greasier plume and demands a more powerful fan able to deliver a higher exhaust rate than light-duty steaming or holding. That's why swapping appliances after the fit-out — say, adding a chargrill under a canopy designed for ovens — should always trigger a review of the ventilation design.
The practical sizing advice for a fit-out: size the canopy to the cookline you'll have in three years, not the one you're opening with. Adding 300 mm of canopy at design stage is cheap; extending a live canopy and its duct later is not. Browse the exhaust canopy collection with your appliance schedule in hand, and let the widths on offer inform how the cookline is arranged beneath.
Makeup Air: The Half of the System Everyone Forgets
Every litre of air a ducted canopy pushes out of the building has to be replaced by a litre coming in — that replacement stream is makeup air. Skip it and the kitchen goes into negative pressure: doors become hard to open, the canopy's own capture performance collapses because the fan is starved, gas appliance combustion can be affected, and air gets dragged in from wherever it can find a path — under doors, through the dining room, even back down other flues.
A properly designed system introduces makeup air deliberately — via dedicated mechanical supply, transfer from adjacent spaces, or both — tempered and positioned so it doesn't blast across the cookline and disturb the very plume the canopy is capturing. Balancing exhaust and supply is core to an efficient mechanical design, and it's part of what your contractor prepares. (Ductless canopies largely sidestep this, since air is recirculated rather than removed — one of their genuine advantages on difficult sites.) For a fuller treatment of airflow and the compliance context, see the commercial kitchen ventilation guide.
Filters, Cleaning Schedules and the Grease-Fire Question
Whatever canopy you choose, the filters are where the ongoing work lives.
Ducted canopies typically run stainless steel baffle filters: angled vanes force the greasy airstream through sharp direction changes, flinging grease into collection channels. Baffles are removable and washable, and in a busy kitchen that wash needs to happen weekly or more — a grease-loaded filter restricts airflow and becomes fuel. Grease still slowly accumulates in the plenum, duct and fan behind them, so periodic professional cleaning of the full system is part of responsible operation (and commonly expected by insurers).
Ductless canopies add consumable stages: the grease-capture filters are washable, but particulate and activated-carbon stages saturate over time and must be replaced on schedule. A recirculating hood with exhausted carbon isn't just less effective — it's returning unfiltered odour and fine particulate to the room, which defeats the purpose of the unit. Build the replacement cycle into your maintenance budget from day one.
The fire safety risk deserves plain language: accumulated grease in filters, canopies and ducts is a well-recognised ignition and fire-spread hazard — a flare-up on the cookline can ignite a neglected filter, and a contaminated duct can carry fire through the building fast. The defence is unglamorous and effective: clean filters on schedule to keep the system hygienic and protect both staff and the building, keep records, and have the system professionally cleaned and inspected at intervals suited to your cooking load. Your certifier, insurer or fire authority can advise what's appropriate for your venue.
Stainless Steel Construction, Custom Options and What's Included
Almost every serious unit in this category is a stainless steel commercial exhaust hood, and for good reason: stainless steel construction shrugs off heat, degreasers and daily wipe-downs, stays food-safe, and is durable enough to outlast several generations of the appliances beneath it. Between products, the differences lie in gauge, finish, manufacturing quality and how the filters are housed rather than in the material itself.
Before you purchase, check what each product listing actually provides. Most ducted canopies are supplied as a shell rather than a complete kit — the fan and ducting are specified separately so the mechanical designer can match them to the site, which is a feature, not a shortcoming. Check whether standard modular widths suit your cookline or a made-to-measure fabrication is warranted, and confirm rated capacity and clearances against your appliance schedule. Comparing brands on these points, rather than on price alone, is how venue owners avoid paying a premium for a canopy that can't do the job — and if a specification doesn't add up, we're happy to provide guidance to customers weighing up options.
Installation and Certification: Who Signs It Off
A commercial kitchen exhaust canopy is supplied equipment, but a compliant exhaust system is a designed installation. Between the two sit decisions about duct sizing and routing, fan selection, fire protection, discharge location, makeup air and controls — all of which are assessed against AS 1668.2 and the requirements of your local council or building certifier. Interpretations also vary between jurisdictions — a design accepted in Melbourne isn't automatically accepted in Brisbane, so proper installation starts with local advice. The practical sequence for a fit-out looks like this:
- Lock the menu and appliance schedule first. Cooking duty drives everything downstream.
- Engage a mechanical services contractor or designer early — before ordering the canopy — so the hood dimensions, duct path and fan are designed as one system.
- Confirm the approval pathway with your council or certifier, especially for ductless/recirculating systems, solid-fuel cooking, or unusual discharge locations.
- Order the canopy to the design, not the other way around — whether that's a modular ducted run or a recirculating unit from the ductless exhaust canopy range.
- Commission and document: have the installing technician verify airflow, set the filter schedule and cleaning regime, and keep the paperwork with your food-business records for whoever must certify the system.
Canopy selection is a well-trodden path — a good mechanical contractor will turn your appliance schedule into a hood specification quickly. The trap is only ever doing it in the wrong order.
Frequently Asked Questions
What is the difference between a ducted and ductless exhaust canopy?
A ducted canopy extracts cooking fumes through ductwork and discharges them outside the building, while a ductless canopy filters the air through grease, particulate and carbon stages and recirculates it back into the room. Ducted systems suit the full range of commercial cooking including heavy-grease duty; ductless systems suit light-to-medium cooking on sites where running ductwork is impossible or impractical.
Can I use a ductless exhaust canopy for any type of cooking?
No. Ductless canopies are generally designed for light-to-medium cooking duty and have stated appliance capacity limits. Heavy-grease cooking such as high-volume frying or chargrilling, and solid-fuel appliances, are typically outside what a recirculating filter train can handle. Always match the unit's rated capacity to your appliances and confirm acceptance with your council or certifier.
How big should a commercial kitchen exhaust canopy be?
As a general principle, the canopy must overhang the cooking surface on every open side and sit at a height where the rising plume is still captured — island canopies need more generous overhang than wall canopies. The exact dimensions for your kitchen are a mechanical design calculation made against AS 1668.2 and your local council or certifier's requirements, based on your appliance duty and layout.
What is makeup air and do I need it?
Makeup air is the replacement air introduced into the kitchen to balance the air a ducted canopy extracts. Without it the kitchen goes into negative pressure, which degrades canopy capture, affects gas appliance operation and pulls air uncontrolled through the building. Ducted systems need makeup air designed as part of the installation; recirculating ductless systems generally do not, since air is returned to the room.
How often should exhaust canopy filters be cleaned?
Washable grease filters in a busy commercial kitchen typically need cleaning weekly or more, with frequency set by cooking load — a grease-loaded filter restricts airflow and is a fire hazard. Carbon and particulate stages in ductless canopies must be replaced on schedule rather than washed, and the full exhaust system should be professionally cleaned periodically. Your certifier or insurer can advise intervals for your venue.
What are commercial exhaust canopies made from?
Almost all commercial exhaust canopies are made from stainless steel. Stainless steel construction is durable, easy to clean and suited to a food environment, which is why it is the industry default for both ducted and ductless hoods. Differences between models come down to steel gauge, finish, manufacturing quality and filter design rather than the base material.
Ready to spec the hood for your fit-out? Start with the commercial exhaust canopy collection to see widths, styles and ducted and recirculating options side by side — and if you'd like help matching a canopy to your appliance schedule and site constraints, get in touch with our team and we'll point you in the right direction before you order.
