Key takeaways
- 30 inches equals 2.5 linear feet.
- 2.5 feet × 100 CFM per foot gives a baseline of 250 CFM.
- Add roughly 25% for frequent frying or a relatively inefficient duct route: 250 × 1.25 = about 313 CFM.
- A 300–400 CFM hood is therefore a sensible target, provided the ductwork can support it.
The best under cabinet range hoods are usually 30-inch or 36-inch ducted models with at least 300–400 CFM for everyday cooking, quieter multi-speed controls, and removable dishwasher-safe filters; choose a ductless model only when exterior venting is impractical.
Our top picks
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Quick comparison: which under-cabinet hood fits your kitchen?
| Cooking situation | Recommended hood class | Ventilation target | Best installation choice |
|---|---|---|---|
| Electric cooktop, light daily cooking | 30-inch convertible hood | 200–300 CFM | Ducted if a vent already exists; ductless otherwise |
| Gas range with four burners | 30-inch or 36-inch high-output hood | 300–400 CFM | Ducted, using the largest practical rigid duct |
| Frequent frying, wok cooking, or searing | 36-inch hood with stronger blower | 400–600 CFM | Ducted with a short, properly sized route |
| Island or peninsula cooking | Island or ceiling-mounted hood | 600 CFM or more may be appropriate | Use a model designed for open-sided installation |
| Apartment with no permitted exterior duct | Convertible hood in recirculating mode | Use the highest practical setting | Ductless, with regular carbon-filter replacement |
CFM means cubic feet per minute, but the number on the box is not the whole story. A hood can have a high maximum rating and still perform poorly if its duct is undersized, full of sharp bends, or blocked by a clogged filter. Noise also tends to rise with airflow, so the most useful hood is one that captures smoke effectively at a setting you will actually use.
Ducted versus ductless: the decision that matters most
Ducted ventilation
A ducted hood pulls cooking air through a filter and exhausts it outdoors. This is the strongest option for removing smoke, moisture, combustion byproducts, and cooking odors. It is especially important over gas burners, where indoor air quality is a larger concern.
Choose ducted installation when an exterior wall, roof route, or existing kitchen duct is available. Look for a hood supporting the duct size required by its installation instructions. A short, smooth, rigid metal duct normally moves air more effectively and quietly than a long flexible run with several bends. The exterior termination also needs a backdraft damper and weather-resistant cap.
Ductless or recirculating ventilation
A ductless hood sends air through a grease filter and a replaceable activated-carbon filter before returning it to the kitchen. It can reduce grease and some odor, but it does not remove humidity, heat, or all combustion pollutants. It is a compromise rather than an equal substitute for exterior exhaust.
Ductless installation makes sense in a rental, a concrete high-rise, or a kitchen where building rules prohibit a new exterior penetration. Select a model with an available recirculation kit and replacement carbon filters. If the manufacturer does not clearly list those parts, maintenance can become difficult and expensive.
How much ventilation power do you need?
For a wall-mounted under-cabinet hood, a useful starting point is about 100 CFM per linear foot of cooking surface for gas cooking, with lower airflow often adequate for electric or induction cooking. Treat this as a planning rule, not a guarantee. A powerful gas range, high-BTU wok burner, or frequent high-heat cooking may justify more.
For example, consider a 30-inch gas range:
- 30 inches equals 2.5 linear feet.
- 2.5 feet × 100 CFM per foot gives a baseline of 250 CFM.
- Add roughly 25% for frequent frying or a relatively inefficient duct route: 250 × 1.25 = about 313 CFM.
- A 300–400 CFM hood is therefore a sensible target, provided the ductwork can support it.
This calculation does not mean a 600 CFM hood is automatically better. Very high airflow can increase noise, pull conditioned air from the room, and require makeup air provisions under local building rules. Check local code before installing a high-output hood, particularly above a powerful gas range.
Best under-cabinet range hood categories
Best all-purpose choice: 30-inch convertible hood, 300–400 CFM
This is the most practical category for a standard 30-inch range. Look for three or more fan speeds, a low-speed setting, LED lighting, dishwasher-safe metal filters, and both top and rear duct options if your cabinet layout is restrictive. Convertible models from established manufacturers such as Broan-NuTone and GE are widely available in this format.
These hoods suit most electric, induction, and moderate-output gas ranges. A 30-inch hood should normally be at least as wide as the cooking surface. If the cabinet allows it, a slightly wider hood can improve capture at the edges.
Best for frequent high-heat cooking: 36-inch, 400–600 CFM class
A 36-inch hood gives more capture area around a 30-inch range and can be a better choice for frying, griddling, wok cooking, and large cookware. Look for a blower with enough low-speed control that it does not need to run at maximum for ordinary boiling or sautéing.
Models in this class include higher-output under-cabinet lines from brands such as Zephyr, Hauslane, and Broan-NuTone. Compare the required duct diameter, sound rating, and whether the stated CFM is measured at free air or under installed resistance. Those figures are not always directly comparable between brands.
Best for limited installation: convertible hood used ductless
A convertible hood with a recirculation kit is preferable to a permanently ductless design when you may later remodel or move. It gives you the option of exterior exhaust in the future. However, budget for carbon-filter replacements and expect odor control to weaken as the filters load with grease.
Noise: compare operating levels, not just maximum CFM
Manufacturers may list noise in sones or decibels. Sones are intended to describe perceived loudness, while decibels are a measured sound-pressure value. Neither number is perfectly comparable unless the measurement conditions match.
| Operating condition | Useful target | What it means in practice |
|---|---|---|
| Low speed | About 1–2 sones or roughly 40–50 dB, where specified | Suitable for simmering and ordinary conversation |
| Medium speed | About 3–5 sones | Clearly audible but comfortable for most cooking |
| Maximum speed | Often 6 sones or more | Useful for searing or frying, but not usually quiet |
The installed duct is a major noise source. A hood with an excellent published sound rating may become loud when connected to a narrow duct, a long flexible tube, or several 90-degree elbows. Prioritize a genuinely quiet low setting over an impressive maximum-speed claim.
Fit and cabinet-width checklist
- 30-inch cabinet: Choose a 30-inch hood unless the manufacturer specifies a narrower unit. Confirm that the body, controls, and duct collar fit between cabinet sides.
- 36-inch cabinet: A 30-inch hood leaves side clearance; a 36-inch hood provides better capture if the range is also 36 inches wide.
- 24-inch cooking surface: A 24- or 30-inch hood can work, but check the minimum cabinet opening and recommended mounting height.
- Shallow cabinets: Measure the hood depth and the position of the duct outlet. A rear-venting option can prevent interference with shelves.
- Mounting height: Follow the hood and range manufacturers’ instructions. Gas and electric appliances may have different minimum clearances.
- Cabinet underside: Confirm whether the hood requires a recessed bottom, mounting brackets, or a custom cutout.
Do not measure only the visible cabinet width. Record the interior opening, cabinet depth, distance to the wall, duct direction, electrical outlet location, and the clearance from the cooking surface. A hood that fits the outside dimension may still block a shelf or fail to align with the existing duct.
Filter maintenance and running cost
Metal grease filters should usually be cleaned about monthly with regular cooking, or more often when frying. Dishwasher-safe aluminum or stainless-steel filters are convenient, but follow the manufacturer’s cleaning instructions because harsh detergents can discolor some finishes.
For ductless operation, carbon filters commonly need replacement every three to six months, depending on cooking frequency. Heavy frying can shorten that interval. A simple maintenance schedule is:
- Wipe the hood exterior weekly to prevent grease buildup.
- Wash the grease filters monthly.
- Inspect the blower intake and duct connection every few months.
- Replace carbon filters when odors persist after cleaning or at the manufacturer’s stated interval.
Never operate a ductless hood without its required carbon filter, and never treat a carbon filter as a substitute for cleaning the metal grease filter. Saturated filters restrict airflow and can increase both noise and fire risk.
Bottom line
For most kitchens, the best under-cabinet range hood is a 30-inch convertible model delivering roughly 300–400 CFM, with a quiet low setting, washable metal filters, and a ducted installation option. Choose a wider 36-inch, 400–600 CFM class hood for frequent high-heat cooking. If exterior venting is impossible, a ductless model can reduce grease and odors, but its carbon filters require ongoing replacement and it will not remove heat or moisture from the room.
