Standard Kitchen Hood Widths: Common Sizes and How They Fit Your Cooktop

Why Width Is the First Specification to Check

When you shop for a range hood, width is the dimension that determines whether the unit physically fits your space and covers your cooking surface. Unlike height or depth, which can be adjusted during installation, width is fixed by the hood's body. Most manufacturers build hoods in a small set of standard widths, so understanding those options narrows your search quickly.

The width you need is tied directly to your cooktop or range. A hood that is too narrow will miss steam, smoke, and grease rising from the outer burners, leaving your kitchen less ventilated. A hood that is much wider than the cooktop can look awkward and may interfere with upper cabinets. Matching the hood width to the cooktop width, or choosing one slightly larger, is the practical rule most installers follow.

The Common Widths: 30, 36, and 42 Inches

Three widths dominate the residential market: 30 inches, 36 inches, and 42 inches. The 30-inch hood is the most common because it matches the standard width of most residential ranges and cooktops. It fits easily into a 30-inch space between cabinets and is available in virtually every style, from basic under-cabinet models to high-end wall-mounted chimneys.

The 36-inch hood is the next step up and pairs with larger cooktops, often found in homes with six-burner ranges or wider induction surfaces. It provides more capture area and is a popular choice for serious home cooks. The 42-inch hood is less common in average homes but appears in larger kitchens with professional-style ranges. Some manufacturers also offer 48-inch and 54-inch hoods, but those are niche sizes aimed at commercial-style setups.

How Hood Width Relates to Cooktop Width

The central relationship in sizing is simple: the hood should be at least as wide as the cooktop. A 30-inch cooktop gets a 30-inch hood; a 36-inch cooktop gets a 36-inch hood. Choosing a hood one size larger, such as a 36-inch hood over a 30-inch cooktop, is also acceptable and can improve capture performance, especially with high-output burners.

Going smaller than the cooktop is almost always a mistake. If the hood is narrower, the outer burners sit outside the capture zone, and grease and smoke can drift into the kitchen. For island cooktops, manufacturers often recommend a hood that is slightly wider than the cooktop because there are no walls or cabinets to contain rising air. Always check the manufacturer's sizing chart, as some hoods are rated for a maximum cooktop width.

Wall-Mounted, Under-Cabinet, and Island Hoods: Width Variations

The hood style affects which widths are available and how the width fits your kitchen. Under-cabinet hoods are the most standardized, with 30-inch and 36-inch versions being the norm. They are designed to fit between standard upper cabinets, which are typically spaced 30 or 36 inches apart. Wall-mounted chimney hoods come in the same common widths but often have a larger canopy that flares outward, so the visible width can be slightly wider than the ductwork.

Island hoods are mounted from the ceiling and are available in wider sizes, including 42, 48, and 54 inches, because they serve larger cooktops and open layouts. Downdraft hoods, which rise from the countertop, are less width-dependent and are usually sized to the cooktop. For any style, measure the exact space between cabinets or the island dimensions before ordering, because even a 1-inch mismatch can cause installation problems.

What to Check Before You Buy: Cabinets, Ductwork, and Ventilation Power

Width is not the only dimension that matters. Measure the height of the space above the cooktop, the depth of the hood, and the clearance required by the manufacturer. The hood's ductwork, whether it vents outside or recirculates, also needs space to run through cabinets or ceilings. A hood that is the right width but too deep can block upper cabinet doors, and one that is too tall may violate clearance requirements.

Ventilation capacity, measured in cubic feet per minute (CFM), should be matched to your cooktop's heat output and the size of your kitchen. A common guideline is 100 CFM per 10,000 BTUs of gas burner output, or about 100 CFM per linear foot of electric cooktop. If you choose a wider hood, you may need a higher CFM to move air effectively over the larger capture area. Always confirm the hood's specifications against your cooktop's requirements before purchasing.