What Is a Range Hood, and What Does It Do?
That appliance above your stove has one essential job, and it's more important than most people realize. A range hood — also called a stove hood, vent hood, or cooker hood — captures the smoke, grease, steam, and odors your cooking throws into the air and gets them out of your kitchen before they settle on your cabinets, coat your walls, and linger in the room. Whether you're shopping for your first range hood or replacing an old one, understanding what it does is the foundation for choosing the right type, size, and power.
This guide is the complete overview: what a range hood does and how it works, every main type you can buy, the difference between venting outside and recirculating, and how to size and choose one for your kitchen. Each section links to a deeper resource so you can go from the big picture down to the specifics — starting with the fundamentals of any range hood installation.
So here's the core idea to carry through this guide: a range hood's real job is to capture cooking smoke, grease, steam, and odors right at the cooktop and either vent them outdoors or filter and recirculate them — protecting your indoor air, your surfaces, and your health. The "right" hood comes down to three things: your cooktop (its width and fuel type), your kitchen layout (against a wall, over an island, or with no overhead space), and whether you can vent outside. Get those three right and everything else — type, CFM, finish — falls into place.
What Does a Range Hood (Stove Hood) Do?
A range hood does four things at once: it removes airborne grease that would otherwise film your kitchen, clears smoke and steam so the room stays comfortable, pulls out strong cooking odors, and improves indoor air quality by capturing the pollutants that high-heat cooking releases. That "thing above the stove" isn't decoration — it's the difference between a fresh kitchen and one where every surface slowly turns sticky.
How Does a Range Hood Work?
The mechanism is simple. A motor and fan (the blower) create suction that pulls the rising column of hot, greasy air up into the hood. That air passes through grease filters, which trap oil droplets, and then one of two things happens: a ducted hood pushes the air outside through ductwork, while a ductless hood sends it through a charcoal filter to remove odors and returns the cleaned air to the room. The wider the hood and the closer it sits to the cooktop, the more of the plume it captures.
Range Hood Meaning: What the Term Means
"Range hood" simply means the ventilation canopy installed over a cooking range or cooktop. You'll see the same appliance called a vent hood, exhaust hood, extractor, cooker hood, or written as one word, "rangehood" — they all refer to the same thing. Its uses are what we covered above: capturing grease, smoke, steam, and odors to keep your kitchen clean and its air breathable.
Wall-Mount Range Hoods
A wall-mount (or chimney) hood attaches to the wall above the cooktop, with a visible stainless or glass chimney running up to the ceiling. It's one of the most popular styles because it makes the hood a design feature while delivering strong capture, and it suits any kitchen where the range sits against a wall. A wall-mount range hood typically installs 24 to 30 inches above the cooktop and vents up and out through the wall or roof.
Island Range Hoods
When the cooktop sits in an island with no wall behind it, you need a hood that hangs from the ceiling and looks finished from every side. Because an island is open to cross-drafts on all four sides, an island range hood usually needs a wider canopy and higher airflow than a comparable wall hood, and it's typically mounted a little higher — around 30 to 36 inches above the cooktop. Open-concept kitchens often benefit from 20–30% more airflow to handle smoke that would otherwise drift into adjoining rooms.
Downdraft Vents
A downdraft vent takes the opposite approach: instead of capturing smoke overhead, it pulls it down and away at the cooktop. Built into or just behind the burners, a telescoping panel pops up 10 to 18 inches when you cook and tucks away when you're done, keeping sightlines open — ideal for islands or kitchens with no overhead space. Downdrafts come mainly in 30- and 36-inch widths, and because pulling a plume downward is harder than letting it rise, the best results come from higher airflow (many experts suggest at least 600 CFM). They pair best with electric or induction cooktops; with high-output gas, a strong downdraft can actually pull at the flame, so an overhead hood is usually the better match.
Portable Kitchen Exhaust Fans
Not every kitchen can run ductwork, and not every cook needs a permanent install. A portable kitchen exhaust fan is a compact, plug-in unit that recirculates air — pulling it through grease and charcoal filters and returning it cleaned to the room, with no hole in the wall. It's a practical fit for rentals, dorms, and small kitchens. For a permanent version of the same no-duct approach, a ductless range hood delivers more capture while still skipping the ductwork.
Smart Range Hoods
Smart range hoods add convenience and automation to the fundamentals. Depending on the model, that can mean gesture controls that let you adjust the fan with a wave, sensors that detect heat or smoke and adjust airflow automatically, auto-sync features that link the hood to a compatible cooktop, and app or voice control. ROBAM's hoods, for example, offer gesture control and automatic-sync technology so ventilation responds to your cooking without a touch. The goal is the same as any hood — clean air — with less fiddling with buttons.
Hood Air Vents: Ducted vs. Ductless
Every hood handles its air one of two ways, and this is the single biggest performance decision. A ducted (vented) hood sends cooking air outside through ductwork — the most effective option, since it removes heat and moisture along with grease and odors, and the preferred choice whenever you can vent outdoors. A ductless (recirculating) hood filters the air and returns it to the room, which is invaluable when outdoor venting isn't possible but removes grease and odor rather than heat and moisture. Recirculating also trims effective airflow, so size up if you go that route. Our full ducted vs. ductless comparison breaks down the trade-offs.
What Size Hood for a 30-Inch Range?
Start with width: your hood should be at least as wide as the cooktop, so a 30-inch range calls for a 30-inch hood at minimum — a little wider per side improves capture. For airflow, an electric or induction 30-inch cooktop needs roughly 250 CFM at minimum if you run all burners at once, while a moderate 300–400 CFM suits most 30-inch kitchens; gas is calculated by total burner output at about 1 CFM per 100 BTUs, so a 40,000-BTU range points to around 400 CFM. Heavy searing, frying, or wok cooking pushes those numbers higher. Browse the options in a dedicated 30-inch range hood collection to match width and airflow at a glance.
How to Choose a Range Hood for Your Kitchen
Pulling it together, choosing the right hood is a short checklist:
- Cooktop width and fuel: size the hood at least as wide as the cooktop, and use CFM math (about 100 CFM per linear foot of electric cooktop, or total gas BTUs ÷ 100).
- Kitchen layout: wall-mount for a range against a wall, island for an island cooktop, downdraft or portable where there's no overhead space.
- Ducted or ductless: vent outside if you can; recirculate if you can't.
- Mounting height: generally 24–30 inches above the cooktop (up to 36 for some models and islands).
- Noise and features: check the sone rating at the speed you'll use, and decide which smart or lighting features matter.
If you want a printable decision aid, our list of key questions to ask before buying walks through each of these before you commit.
Frequently Asked Questions
What does a stove hood do?
It captures the smoke, grease, steam, and odors produced while cooking and removes them from your kitchen — either venting them outside or filtering and recirculating the air. This keeps grease off your surfaces, clears heat and steam, and improves your indoor air quality.
How does a range hood work?
A motor-driven fan pulls hot, greasy air up into the hood, where grease filters trap oil droplets. A ducted hood then pushes that air outside through ductwork; a ductless hood passes it through a charcoal filter and returns the cleaned air to the room.
What is the thing above the stove called?
It's a range hood — also known as a stove hood, vent hood, exhaust hood, extractor, or cooker hood. All of these names refer to the same appliance that ventilates the air above your cooktop.
Do I need a ducted or ductless range hood?
Ducted is more effective because it removes heat and moisture along with grease and odors, so choose it whenever you can vent outside. Ductless is the practical choice for interior kitchens, condos, or rentals where running a duct isn't possible.
What size range hood do I need for a 30-inch range?
At least a 30-inch-wide hood, and ideally a little wider. For airflow, plan on roughly 300–400 CFM for a typical 30-inch electric or induction cooktop, or about 400 CFM for a 40,000-BTU gas range — more if you cook with high heat.
What is a downdraft vent, and is it as good as a hood?
A downdraft vent pulls smoke down and away at the cooktop instead of capturing it overhead, and it hides away when not in use. It works well for islands and low-clearance kitchens, especially with electric or induction cooktops, but an overhead hood generally captures high-heat and gas cooking more effectively.
