What Is the Difference Between a Range Hood and an Exhaust Fan?
A range hood is the canopy fitted directly above a cooking surface, shaped to capture grease-laden vapour at the point it rises. An exhaust fan is the motor and impeller that actually moves that air. The short answer: a range hood is a capture device, an exhaust fan is a moving device, and most kitchen setups need both. In a home, the fan usually sits inside the hood itself, which is why the two words get used as though they mean the same thing.
What a range hood is and what it actually does
Capture first, extraction second. The shape of the canopy does work that no amount of fan power can make up for.
A range hood is a hood in the literal sense: an open-bottomed enclosure hung over the stove, cooktop, fryer, or griddle. Its job is to sit in the path of the rising plume so vapour, steam, smoke, and airborne grease collect inside it before they escape into the room. Hot air rises in a column, and if something wide and solid waits above that column, the column runs into it and is contained. That containment is the whole trick.
Inside the hood are filters, and behind them a cavity. Air is drawn through the filters, which knock out grease droplets by forcing the airstream to change direction sharply, and the droplets run down into a small cup or tray. What passes through is pushed onward, either along a duct to an outside wall or roof, or straight back into the room through a charcoal filter.
A hood with no fan is just a shelf. That is why the two get talked about together and why the distinction confuses people: on almost every domestic appliance sold, the fan lives inside the hood housing, so buying a hood means buying a fan.
What a kitchen exhaust fan is
An exhaust fan is the motor and impeller that create the pressure difference pulling air out of the space. It can sit in several places, and where it sits changes how the kitchen behaves.
An exhaust fan moves air from one side of itself to the other. Three common positions:
Inside the hood. The standard domestic arrangement, and the reason a running range hood is loud. The motor is a metre from your ears.
Inline, partway along the duct. Mounted in the ductwork, often in a ceiling void. The kitchen gets quieter because the noise source moved away, and a longer duct run becomes practical.
At the far end, outside. The fan sits on the roof or an exterior wall and pulls the whole duct rather than pushing it. This is the normal commercial arrangement, and the entire duct ends up under negative pressure, so grease-laden air is drawn away from the building interior rather than pushed through joints in it.
Separately, many kitchens have a general exhaust fan in the ceiling or an exterior wall that has nothing to do with the stove. That fan ventilates the room. It is not a cooking appliance and not a substitute for one, because by the time greasy air reaches it the grease has already spread.
Range hood vs exhaust fan: a straight comparison
Two components, two jobs. Reading across the row is the fastest way to see why one does not replace the other.
| Question | Range hood | Exhaust fan |
|---|---|---|
| What it is | A canopy or enclosure with filters, designed to trap a rising plume | A motor and impeller that create airflow |
| Where it sits | Directly over the cooking surface, ideally overhanging its front edge | Inside the hood, inline in the duct, or at the far end on a roof or wall |
| What it moves | Nothing on its own. It contains and directs | Air, measured in cubic feet per minute or litres per second |
| Deals with grease? | Yes. The filters are the primary grease barrier and the grease collects in the canopy | Only what gets past the filters, which coats the blades and housing over time |
| Ducted or recirculating | Ducted sends air outside. Recirculating adds a charcoal filter and returns it to the room | Sized for duct length and bends. A recirculating hood has no duct for it to serve |
Ducted or recirculating: the choice that decides more than brand does
Ducted range hoods send cooking air outside. Recirculating range hoods filter it and give it back. Everything else about the appliance matters less than which of those two it is.
Ducted wins on results, because the heat, the steam, the odour, and the fine grease aerosol all physically leave. Recirculating catches the coarse grease on the mesh, takes the edge off the smell with charcoal, and puts everything else back where it came from. Where a kitchen has an achievable route outside, ducted is the better appliance almost every time.
Recirculating exists because plenty of kitchens have no route. Interior units, mid-floor apartments, and island cooktops often cannot be ducted without serious work. There a recirculating hood is genuinely better than nothing, on two conditions: run it longer than you think you need to, and treat the charcoal filter as a consumable. Charcoal saturates, and unlike the mesh filter in front of it, charcoal is not washable. If a filter clean is overdue, the guide on the best way to clean range hood filters covers what soaks well and what gets ruined.
Two underrated variables sit alongside it. Duct length and bends: a hood pushed through eight metres of flexible duct with four elbows can move less air than a shorter, straighter run on a weaker fan, so if a hood underperforms the duct is a better suspect than the motor. And sizing: a hood narrower than the cooktop leaks at the edges no matter how hard the fan pulls, and mounting it too high lets the plume spread before it reaches the canopy. Both faults look like a weak fan and are not. Running the hood on after the burners go off also does more than a stronger fan used briefly, which the guide on how long you can run a kitchen exhaust fan covers.
What changes when the kitchen is commercial
Same physics, different obligations. In a commercial kitchen the hood and the fan are two ends of one regulated system, and the duct in between is part of it.
Commercially, the canopy is larger and deeper, the filters are steel baffles rather than aluminium mesh, and the fan sits on the roof. Recirculating is not a general-purpose option for commercial cooking, because a cook line producing grease-laden vapour for twelve hours a day generates loading no charcoal cartridge will handle.
The bigger difference is legal rather than mechanical. The Ontario Fire Code adopts the NFPA 96 standard by reference, and that standard treats the canopy, the baffle filters, the plenum cavity behind them, the grease duct, and the rooftop fan as one continuous exhaust path with a maximum grease deposit of 0.078 inches on any surface. Clean the hood, leave the duct, and the system is still out of compliance. Barrie Fire and Emergency Service enforces that code locally, which is why commercial operators book full kitchen exhaust cleaning rather than a filter wash, and why commercial hood cleaning in Barrie ends with a photo report and a signed certificate. If you arrived here about a range hood at home, none of that applies to you, and nothing on this page needs you to hire anybody.
Range hood vs exhaust fan: frequently asked questions
The follow-up questions people ask once the basic distinction lands.
Is a rangehood the same thing as an extractor fan?
Rangehood, range hood, cooker hood, and extractor hood all describe the same appliance: the canopy above the cooking surface. Extractor fan and exhaust fan usually describe the motor and impeller that pulls the air, which may sit inside the canopy or somewhere further along the duct. The naming varies by country more than by hardware, so the useful question is not what it is called but whether the air ends up outside.
Does a recirculating range hood actually remove grease?
A recirculating range hood removes some grease and some odour, then returns the air to the room. The mesh filter catches larger grease droplets and a charcoal filter absorbs part of the smell, but heat, steam, fine grease aerosol, and combustion by-products all stay in the kitchen. It is a reasonable option where no duct route exists. It is not equivalent to venting outside, and the charcoal filter has to be replaced rather than washed.
Can a ceiling exhaust fan replace a range hood over a stove?
A ceiling or wall exhaust fan cannot replace a range hood over a stove. Capture is the reason. A range hood works because the canopy sits directly in the rising plume and traps vapour before it spreads, while a ceiling fan several feet away is trying to catch grease-laden air after it has already mixed with the rest of the room. The fan may be moving plenty of air and still leave a greasy film on the cabinets.
Does the difference matter more in a commercial kitchen?
Yes. In a commercial kitchen the hood and the fan are two ends of one regulated system, and the duct between them is included. The Ontario Fire Code adopts NFPA 96 by reference, and that standard treats the canopy, filters, plenum, duct, and rooftop fan as a single exhaust path that must be kept below a 0.078 inch grease deposit. Recirculating is not a general-purpose option for commercial cooking the way it is at home. The guide to how long a hood cleaning takes covers what that full-path work involves.