What matters most when picking a kitchen hood

The hood you choose depends on three things: how much air it moves (measured in CFM, or cubic feet per minute), where it vents, and how it fits your kitchen layout. A hood that moves too little air leaves cooking smells and steam in your kitchen; one that's too powerful can create drafts and waste energy. The right choice matches your stove size, your cooking habits, and your home's ventilation setup.

Before you shop, measure your stovetop width and find out whether your kitchen can vent to the outside or must recirculate air back into the room. These two facts narrow your options when ready.

Key Takeaways

  • CFM (the volume of air the hood moves per minute) should be roughly 100 CFM per 10,000 BTU of stove output, or at minimum 150 CFM for electric ranges and 200 CFM for gas.
  • Ducted hoods vent to the outside and remove odors and moisture completely; ductless hoods filter and recirculate air, which is cheaper to install but less effective at removing steam.
  • Hood width should match or exceed your stovetop width—undersized hoods miss cooking vapors at the edges.
  • Noise level matters for daily comfort; look for hoods rated 60 decibels or lower if you cook frequently and value quiet operation.
  • Installation location (under-cabinet, wall-mounted, or island) depends on your stove position and kitchen layout, and affects both cost and ventilation performance.

Understanding CFM and what your stove actually needs

CFM stands for cubic feet per minute—the volume of air the hood pulls through its filters and out of (or back into) your kitchen. A hood with too low a CFM leaves cooking odors, grease, and steam hanging in the air. A hood with too high a CFM can create negative pressure in your kitchen, pulling exhaust from your furnace or water heater back into living spaces, which is a safety hazard.

For gas stoves, start with 100 CFM per 10,000 BTU of burner output. Most home gas ranges are between 30,000 and 60,000 BTU total, so you need roughly 300 to 600 CFM. For electric ranges, 150 to 200 CFM is usually enough because electric burners produce less heat and fewer fumes. If you cook with high heat frequently or have a large gas range, aim for the higher end. If you cook occasionally and have a small electric range, the lower end works.

Check your stove's manual or the nameplate on the unit itself for BTU output. If you cannot find it, ask the appliance retailer or manufacturer—guessing wrong costs you either poor ventilation or wasted energy.

Ducted versus ductless: which venting method works for your home

Ducted hoods run a metal duct from the hood to an opening in your exterior wall, roof, or soffit. They pull cooking vapors, odors, and moisture completely out of your home. Ducted hoods are more effective and are the standard choice in most kitchens. The downside is installation cost—running ductwork through walls or attic space can be expensive, especially if your kitchen is far from an outside wall.

Ductless hoods (also called recirculating hoods) pull air through filters that trap grease and odors, then push the air back into your kitchen. They are cheaper to install because they need no ductwork. They work reasonably well for light cooking, but they do not remove moisture, so steam stays in your kitchen and can damage cabinets and walls over time. Ductless hoods also require regular filter replacement—typically every 3 to 6 months depending on cooking frequency.

If your kitchen has an exterior wall or roof access nearby, ducted is worth the extra cost. If your kitchen is in the center of your home or ductwork would require major construction, ductless is a practical compromise. Some kitchens can do both: a ducted hood over the main stove and a ductless hood over an island or secondary cooking area.

Matching hood width to your stovetop

The hood should be at least as wide as your stovetop, and ideally 3 to 6 inches wider on each side. A hood that is narrower than the stove misses vapors rising from the outer burners. A hood that is much wider than the stove wastes energy and may not pull air efficiently because the suction spreads too thin.

Standard stovetop widths are 30, 36, and 48 inches. Standard hood widths match these sizes. If your stove is 36 inches wide, buy a 36-inch hood or larger. If your stove is in an island and you have space, a 48-inch hood over a 36-inch stove is acceptable and gives better coverage. Avoid undersizing—a 30-inch hood over a 36-inch stove will not perform well.

Installation type: under-cabinet, wall-mounted, or island

Under-cabinet hoods mount directly to the cabinet above your stove. They are the most common type, fit into tight spaces, and are usually the cheapest to install if ductwork is already in place. They work well for stoves against a wall.

Wall-mounted hoods (also called chimney or range hoods) are a single tall unit that mounts to the wall above the stove. They are more visible and often more powerful than under-cabinet models. They work best for stoves on exterior walls where ductwork can run straight up and out through the roof or wall.

Island hoods hang from the ceiling above a stove in the middle of the kitchen. They require ductwork to run through the ceiling or down through the floor, which is more complex and expensive. They are worth it if your kitchen layout puts the stove in an island and you want good ventilation without a wall-mounted unit blocking sightlines.

Your stove location largely determines which type makes sense. If the stove is against a wall, under-cabinet or wall-mounted works. If the stove is in an island, you need an island hood or a downdraft system (a vent that pulls air down into the countertop—less common and less effective, but an option if ceiling ductwork is impossible).

Noise level and fan speed controls

Kitchen hoods produce noise because they move a lot of air. Most hoods are rated between 50 and 80 decibels. For reference, normal conversation is about 60 decibels; a loud vacuum is about 70 decibels. If you cook daily and value quiet operation, look for hoods rated 60 decibels or lower on their lowest speed setting.

Multi-speed fans let you run the hood quietly for light cooking and ramp up for heavy cooking. Some newer hoods have variable-speed controls or automatic sensors that detect steam and adjust fan speed. These features cost more but reduce noise and energy use if you cook at varying intensities.

Ductless hoods tend to be louder than ducted hoods because they have to push air through filters and back into the room, creating more resistance. If noise is a concern, a ducted hood will likely be quieter at the same CFM rating.

Filters, maintenance, and long-term costs

Ducted hoods have a grease filter (usually aluminum or stainless steel mesh) that traps cooking grease. Most are dishwasher-safe and last the life of the hood. Some ducted hoods also have a charcoal filter if they recirculate air partially, but most pure ducted hoods do not need charcoal filters because they vent outside.

Ductless hoods have both a grease filter and a charcoal filter. The grease filter is washable, but the charcoal filter must be replaced every 3 to 6 months—this is an ongoing cost. Over 10 years, charcoal filter replacements can add up to $200 to $400 depending on the hood model and how often you cook.

Cleaning the grease filter every 1 to 3 months (depending on cooking frequency) keeps the hood running efficiently and prevents grease buildup, which is a fire hazard. Most filters slide out easily and can be washed in the sink or dishwasher.

Frequently Asked Questions

Can I install a ductless hood if I already have a ducted hood?

Yes. You can remove the old ducted hood and install a ductless one in its place. You will lose the moisture removal that ducting provides, but ductless hoods work fine for light to moderate cooking. If you want to keep the duct in place for future use, you can cap it off inside the wall or attic.

What if my kitchen cannot reach an exterior wall with ductwork?

A ductless hood is your best option. If you absolutely need ducted ventilation, you can run ductwork through the attic and out through the roof, but this is more expensive and requires careful installation to avoid air leaks. Talk to a contractor about what is feasible in your home before buying the hood.

Do I need a more powerful hood if I cook with gas?

Yes. Gas burners produce more heat and more combustion byproducts than electric burners, so they need higher CFM. A gas range typically needs 300 to 600 CFM; an electric range typically needs 150 to 200 CFM. Check your stove's BTU output to be sure.

How high should the hood be above the stove?

Most hoods mount 24 to 30 inches above the stovetop surface. Check the hood's manual for the manufacturer's recommended height—mounting it too high reduces suction, and mounting it too low can be a burn hazard. Wall-mounted hoods often sit higher than under-cabinet hoods.

Will a bigger hood always work better?

Not necessarily. A hood that is too powerful for your kitchen can create negative pressure, pulling exhaust from furnaces or water heaters into living spaces. It also wastes energy. Match the CFM to your stove's output and your kitchen size, not just buy the biggest hood available.