What Size Range Hood Do You Need? Explained

A range hood should generally be at least as wide as your range or cooktop. When space allows, extending it about 3 inches beyond each side can improve capture.

That means a 36-inch hood is worth considering over a 30-inch range, and a 42-inch hood over a 36-inch range. The extra width gives smoke and steam more room to rise into the hood instead of escaping around its edges.

A hood that matches the cooking surface’s width can still be an appropriate choice. Its depth, mounting height, airflow and design matter too. A wider hood does not make up for poor installation or inadequate ductwork.

If you want a wider hood, allow for it in the cabinet layout before ordering. The space between the cabinets needs to accommodate the hood and any required clearances.

For a 30" range, consider a 30" or 36" hood; for a 36" range, consider a 36" or 42" hood, depending on the appliance requirements and available space.

For a 48-inch range, consider a 48" hood or a wider 54" option, depending on the appliance requirements and available space.

These are common planning combinations, not a substitute for the appliance specifications. High-output cooking equipment, indoor grills and island installations may need different coverage or ventilation capacity.

Also check the actual dimensions. A hood’s advertised size does not tell you everything about its installation opening, depth or required clearance from surrounding cabinets.

The hood needs enough depth to capture fumes from the cooking surface, including the front burners. Check the manufacturer’s coverage recommendations rather than choosing by width alone.

This is easy to overlook because most people compare hoods by their width and appearance.

If you regularly cook on the front burners, look at where those burners sit in relation to the hood above them. A shallow hood may leave much of that cooking area beyond its effective coverage.

Depth also affects how the kitchen feels. A hood that projects farther into the room may capture well, but its shape and installation height need to work for the person standing at the range.

This is one reason I look at the range and hood together. A hood can fit the space between the cabinets and still be a poor match for the appliance below it.

The right CFM depends on your cooking equipment, cooking habits, hood design and ductwork. Use sizing formulas as a starting point, then confirm the recommendations for the range and hood you’re considering.

CFM stands for cubic feet per minute. It measures airflow [how much air the hood can move].

Common starting guidelines include:

• High-output gas cooking: approximately 1 CFM for every 100 BTUs of total burner output.
• Wall-mounted ventilation over conventional electric cooking: approximately 100 CFM per linear foot of cooking surface.
• Island ventilation: approximately 150 CFM per linear foot of cooking surface.

For example, a gas cooking surface with a total burner output of 75,000 BTUs produces a starting estimate of 750 CFM using the gas guideline. That calculation helps you begin the conversation; it does not complete the specification.

Induction still needs ventilation. The appliance does not produce gas combustion fumes, but the food you cook still produces grease, steam, odors and smoke.

How you cook matters as well. Frequent searing, frying or wok cooking creates different demands than mostly simmering and reheating.

Finally, check which airflow rating you’re comparing. A “maximum blower CFM” figure may differ from the hood’s certified airflow rating. Long duct runs, multiple elbows and undersized ducts can further reduce the airflow you get after installation.

No. Choose enough airflow for your cooking needs, along with good coverage, suitable ductwork and a noise level you can comfortably use.

A larger blower cannot solve every ventilation problem. If the hood is too shallow, mounted too high or connected to unsuitable ductwork, cooking fumes can still escape.

Higher capacity can also add cost and make-up air requirements. Noise depends on the particular hood, operating speed, blower location and duct design, not just its maximum CFM.

Compare sound ratings at similar airflow levels. A hood’s quietest setting may sound appealing, but that setting also needs to provide useful ventilation for your cooking.

If the hood is too loud, people don’t turn it on. That needs to be part of the selection.

Use the installation requirements for both the hood and the range or cooktop. The approved mounting height varies by model and cooking equipment.

You’ll often see residential hood clearances somewhere between 24 and 36 inches above the cooking surface, but that is a general planning range, not an instruction for your installation.

Measure from the cooking surface to the bottom of the hood, not from the floor or the countertop beside the range.

Mounting the hood higher can reduce capture. Mounting it too low can interfere with cooking and may violate required clearances. If the hood and cooking appliance instructions appear to conflict, have the installer resolve that with the manufacturers before installation.

Ceiling height matters too. Chimney-style hoods have limits on how short or tall their chimney sections can be. A taller ceiling may require an extension, while a lower ceiling may rule out a particular model.

Check those dimensions before ordering.

Usually, yes. A decorative wood or plaster hood is the enclosure; a compatible insert or ventilation assembly inside it does the work of capturing and exhausting cooking fumes.

Depending on the system, you may need an insert, a protective liner and a blower. Some products combine these components, while others require separate selections.

The decorative enclosure’s outside width does not tell you the size of the ventilation opening inside it. A large-looking hood can contain an insert with a much smaller capture area.

Before the enclosure is ordered or built, coordinate:

• The insert’s exact model and dimensions.
• The required opening and internal space.
• The liner and blower configuration.
• The duct size and connection location.
• Installation clearances and access for maintenance.

The cabinetmaker or hood fabricator and the installer need the same specifications. “It’s a 36-inch hood” is not enough information to confirm that everything will fit.

Yes, whenever possible. A ducted range hood carries cooking fumes, moisture and heat outdoors rather than returning the filtered air to the kitchen.

The duct must terminate outdoors. It should not discharge into an attic, wall cavity, ceiling space or crawl space.

A short, direct route generally performs better than a long route with several turns. Follow the hood manufacturer’s requirements for duct material, size and maximum run length.

Do not assume an existing duct will work with a new hood. Its size and route need to be checked against the new model’s specifications.

Where the duct can go is a layout question, not an install-day question. Ceiling framing, windows, the floor above and the location of an exterior wall can all affect the route. Confirm that route before finalizing the range location.

Ductless range hoods can filter grease and reduce some odors, but they do not exhaust cooking heat, moisture or gas combustion fumes outdoors.

Also called recirculating range hoods, these units pull air through filters and release it back into the room.

They can be a practical option where exterior venting is not feasible, such as some condos or apartments. However, they are a compromise, and they need to be approved for the intended installation.

Grease filters require regular cleaning. Odor filters, often made with activated charcoal, need replacement according to the manufacturer’s instructions and how frequently you cook.

For gas cooking, pay particular attention to the cooking appliance’s ventilation requirements and local rules. A recirculating hood does not provide the same removal of combustion pollutants as a properly installed ducted system.

If you have a realistic opportunity to vent outdoors during a renovation, plan for it early.

Make-up air is outdoor air supplied to replace air exhausted by the hood. Whether you need a dedicated system depends on local code, the hood’s capacity and conditions in the home.

You’ll often see 400 CFM mentioned as a threshold, but the rules and exceptions vary. Confirm the requirements for your project before choosing the hood.

Exhausting air lowers pressure inside the house unless replacement air can enter. This can reduce hood performance and, in some homes, interfere with the safe venting of fuel-burning appliances.

A make-up air system may include a damper that opens when the hood operates. Depending on the climate and installation requirements, the incoming air may also need tempering.

This adds planning and cost, so involve the HVAC contractor early.

Choose the ventilation your cooking equipment needs, then coordinate the replacement air. Selecting a lower-capacity hood simply to avoid make-up air can leave you with inadequate ventilation.

An island cooktop generally needs ventilation designed for an island installation, with coverage and airflow suited to cooking without a wall behind it.

With no wall to help contain the rising fumes, air movement in the room can carry them away from the hood. Wider coverage is often helpful, but the manufacturer’s recommendations should guide the selection.

An island hood also needs a workable duct route and structural support in the ceiling. Both should be checked before the island layout is finalized.

Downdraft systems and ceiling-mounted ventilation are alternatives, but each has limitations. Downdrafts pull fumes toward an intake beside or behind the cooking surface, which can make capture more difficult with tall pots. Ceiling-mounted systems need to be designed for the installation height and cooking equipment.

If you’re still deciding whether the cooktop belongs on the island, consider the ventilation along with the seating, sightlines and workspace. See How Much Space Do You Need Around a Kitchen Island? Explained.

Range hood noise is often measured in sones: lower numbers mean quieter operation. Compare sound ratings at similar airflow levels and at the speeds you expect to use.

A low-speed sound rating tells you little about how the hood will sound when you’re searing dinner.

Look for both the airflow and noise rating at normal operating speed, plus the rating on high. If possible, hear the hood running before purchasing it.

Some systems use an inline or exterior blower designed to place the motor farther from the kitchen. This can reduce motor noise, although you may still hear air moving through the hood and ductwork.

Duct sizing and installation matter too. An unsuitable duct can reduce airflow and increase noise.

The goal is a hood you can comfortably run while cooking, especially in a kitchen that opens to the living or dining area.

A permit may be required, particularly when the installation involves new ductwork, electrical work or make-up air; confirm with your local building department. See Do You Need a Permit for a Kitchen Remodel?

The range, hood and cabinets need to be planned together. Before ordering, confirm the exact appliance models, ventilation components, installation heights and duct route.

Go deeper: The Right Order for Choosing Your Materials and Fixtures, in The Renovation Blueprint, explains how to coordinate these selections before they affect your cabinet order or construction.

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Exact product installation instructions take precedence over general sizing guidance.