Ducted vs Ductless Range Hoods: Which Ventilation Is Right for Your Kitchen?

Kitchen ventilation is one of those things nobody thinks about until it goes wrong — and then it is all anyone thinks about. Lingering cooking smells that drift through the whole house, a sticky film on nearby surfaces, a smoke alarm that shrieks every time you sear a steak: these are the symptoms of a range hood that is undersized, poorly installed, or simply the wrong type for the kitchen. Getting ventilation right is not glamorous, but it protects your cabinets, your walls, your indoor air, and your enjoyment of cooking.

The central decision most homeowners face is ducted versus ductless. A ducted hood vents cooking exhaust outside the house through ductwork; a ductless (recirculating) hood filters the air and returns it to the kitchen. Each has real advantages and genuine limitations, and the right choice depends on your cooking style, your home's structure, and where your kitchen sits in the house. This guide covers both options honestly — plus hood types, CFM sizing, ducting, noise, mounting heights, and how to plan ventilation into a remodel before it becomes an expensive afterthought.

Why Kitchen Ventilation Matters More Than Most People Realise

Cooking releases far more into the air than aroma. Gas hobs produce combustion byproducts including nitrogen dioxide and carbon monoxide. High-heat cooking — frying, searing, stir-frying — generates fine grease particles and smoke. Even boiling a large pot releases substantial moisture. Without effective extraction, all of this settles somewhere: on cabinet faces, on walls and ceilings, into soft furnishings, and into the air your household breathes.

Over time, inadequate ventilation shows up as yellowing paint, sticky cabinet surfaces that attract dust, persistent odours embedded in curtains and upholstery, and in damp-prone homes, moisture problems around the cooking area. A well-chosen, correctly sized range hood captures the majority of these pollutants at the source — the single most effective step you can take for kitchen air quality. It is also one of the elements most worth planning early in a full kitchen remodel, because ducting routes, electrical supply, and clearances are all far easier to arrange before cabinets and worktops go in.

The Main Hood Types, Explained

Before comparing ducted and ductless, it helps to know the physical formats, since each suits different kitchen layouts.

Under-Cabinet Hoods

The most common type in existing kitchens. An under-cabinet hood mounts beneath a wall cabinet directly over the hob, using the cabinet above for concealment and support. They are compact, unobtrusive, and the easiest to retrofit, since most kitchens already have a cabinet in that position. Their capture area is limited to the cabinet's footprint, which is adequate for standard four-burner hobs but less generous than a chimney hood. Most under-cabinet models can be installed either ducted (venting up through the cabinet and out) or ductless (recirculating back into the room).

Wall-Mount Chimney Hoods

The classic statement hood: a canopy over the hob with a chimney stack rising to the ceiling, mounted against a wall. Chimney hoods offer a larger capture area than under-cabinet models and suit kitchens where the hob sits on an exterior or interior wall without cabinets above. They are almost always ducted — the chimney is designed to conceal the duct run — though convertible models exist. From a design perspective they become a focal point, which is worth considering when planning kitchen cabinets and sightlines around the cooking zone.

Island Hoods

For hobs set into a kitchen island, an island hood hangs from the ceiling above. These face the toughest extraction challenge: with no wall to help contain the rising plume, cooking effluent disperses in every direction, so island hoods need generous capture area and strong airflow to perform well. Ducting an island hood means running ductwork through the ceiling — straightforward in a single-storey home or where the kitchen sits below an accessible loft, more involved where a finished storey sits above. Island hoods are almost always ducted for best results.

Range Hood Inserts (Power Packs)

An insert is the working mechanism of a hood — fan, filters, lights — designed to be built into a custom enclosure, such as a timber canopy, a plastered hood surround, or custom cabinetry. Inserts are popular in bespoke and traditional-style kitchens where the homeowner wants the ventilation performance without a visible stainless appliance. They are typically ducted and offer strong performance, but the custom surround must be designed with adequate internal space, service access for filter changes, and proper clearances.

Downdraft Ventilation

Downdraft systems sit behind or beside the hob and pull cooking effluent downward, either into ductwork below the floor or through filters for recirculation. Some rise telescopically from the worktop when needed and retract when not in use. The appeal is a clean, unobstructed sightline — popular on islands and in open-plan kitchens. The physics, however, work against them: heat and smoke naturally rise, so pulling them downward requires strong airflow and works best with modest cooking. Downdraft is generally considered the least effective extraction type for heavy cooking, though it is a legitimate solution where an overhead hood is impractical.

Ducted Range Hoods: How They Work and Where They Win

A ducted hood captures cooking exhaust at the canopy, passes it through a grease filter (usually metal mesh or baffle), and expels it outside the house through rigid or semi-rigid ductwork terminating at a wall cap or roof vent. The pollutants leave the building entirely — grease, smoke, moisture, odours, and combustion byproducts included.

This is the fundamental advantage of ducted ventilation: removal rather than filtration. A properly sized and installed ducted hood eliminates the large majority of cooking pollutants from the indoor environment. For households that cook frequently, cook with gas, or do a lot of high-heat frying and searing, ducted extraction is decisively the better performer. There is no filter medium to saturate with odours, no charcoal to replace on a schedule, and no recirculated air carrying residual smells back into the room.

Ducted hoods also handle moisture effectively — meaningful in kitchens where large pots boil for extended periods — and they keep grease out of the kitchen rather than trapping a portion of it in a filter that must then be cleaned or replaced. When a kitchen is being planned from scratch, designing in a ducted route is one of the highest-value decisions in the ventilation plan, and it sits naturally alongside early decisions about kitchen countertops and worktop layout, since the hob position determines the duct route.

The Limitations of Ducted

Ducted is not always practical. The duct run must reach an exterior wall or the roof, and every bend in the run reduces performance — long runs with multiple elbows can substantially cut effective airflow. In flats, condominiums, and some terraced homes, running new ductwork may be structurally impractical or restricted by building rules. Homes where the kitchen sits deep in the interior, far from any exterior wall, face the same challenge: the duct route may require opening ceilings or bulkheads, adding meaningful complexity to the project.

Installation is also more disruptive than ductless. Cutting a wall or roof penetration, routing ductwork, and making good afterwards is real construction work — straightforward during a remodel when walls are open, considerably more annoying as a standalone retrofit. And ducted hoods still need their metal grease filters cleaned regularly; ducting removes the exhaust, but the filters that protect the fan and ductwork from grease buildup need routine attention.

Ductless (Recirculating) Range Hoods: How They Work and Where They Fit

A ductless hood pulls cooking air through a grease filter and then through charcoal (carbon) filters that absorb odours, before blowing the filtered air back into the kitchen. Nothing leaves the house; the air is cleaned as well as filtration allows and recirculated.

The overwhelming advantage is installation flexibility. With no ductwork required, a ductless hood can go virtually anywhere — flats, interior kitchens, rental properties, anywhere running a duct is impractical or prohibited. Installation is simpler, faster, and less disruptive, which makes ductless the pragmatic choice for many retrofit situations and for kitchens where the hob cannot be repositioned near an exterior wall.

The Honest Limitations of Ductless

The trade-offs are real and should be understood before choosing. First, filtration is not removal. Charcoal filters absorb a meaningful share of odours but do not capture everything, and they do nothing about moisture or combustion byproducts — those stay in the kitchen air. A ductless hood will never match a ducted hood's effectiveness against heavy frying odours or gas combustion pollutants.

Second, the maintenance reality: charcoal filters saturate. Depending on cooking frequency, they typically need replacing every few months of regular use, and a saturated filter does little beyond moving air around. This is an ongoing consumable commitment — filters must be bought, remembered, and changed — and households that neglect it end up with a hood that looks functional but performs poorly. Metal grease filters still need regular cleaning too, just as with ducted models.

Third, recirculation returns slightly warmed air to the kitchen. In most cases this is a minor effect, but it is worth knowing. Finally, because the air is not actually exhausted, ductless hoods do less to protect nearby surfaces from the fine grease film that heavy cooking produces — relevant when refacing or replacing cabinets near the cooking zone, where every bit of extraction performance counts.

When Ductless Is the Right Call

Despite the limitations, ductless is genuinely the right answer in several common situations: flats and condos where exterior ducting is not permitted; kitchens located deep in a home's interior where a duct run would be tortuous; rental properties where structural modifications are off the table; light-cooking households where the hob sees gentle use and heavy frying is rare; and tight remodelling budgets where the ductwork scope would unbalance the project. A well-maintained ductless hood with fresh charcoal filters is meaningfully better than no hood at all — the comparison that matters is not ductless versus ducted, but ductless versus nothing.

Ducted vs Ductless: The Direct Comparison

Extraction effectiveness: Ducted wins clearly. It removes pollutants from the building; ductless filters and recirculates.

Odour control: Ducted wins for heavy cooking. Ductless with fresh charcoal filters handles light-to-moderate cooking odours adequately.

Moisture and combustion byproducts: Ducted removes them; ductless does not.

Installation complexity: Ductless wins by a wide margin — no ductwork, no exterior penetration.

Ongoing maintenance: Ducted needs regular metal filter cleaning. Ductless needs that plus scheduled charcoal filter replacement — a higher ongoing commitment.

Suitability for flats and interior kitchens: Ductless is often the only practical option.

Suitability for heavy/gas cooking: Ducted is strongly preferable.

Flexibility for future changes: Ductless hoods are easier to relocate or replace.

For most homeowners with the structural option to duct, ducted is the better long-term investment in kitchen air quality and home protection. Where ducting is impractical, a quality ductless hood, diligently maintained, is a respectable and honest solution.

CFM Sizing: Rules of Thumb That Actually Work

CFM — cubic feet per minute — measures how much air the hood moves. Undersized hoods are the most common ventilation mistake: they look the part but cannot capture the effluent from a fully loaded hob. Two rules of thumb cover most residential situations.

Rule 1: 100 CFM per linear foot of hob width. A standard 30-inch (2.5-foot) hob calls for roughly 250 CFM as a baseline. A 36-inch (3-foot) hob calls for roughly 300 CFM. This rule suits electric hobs and moderate cooking.

Rule 2: 100 CFM per 10,000 BTU for gas hobs. Add up the BTU ratings of your burners — a typical four-burner gas hob might total 40,000 to 60,000 BTU — and allow 100 CFM per 10,000 BTU. A 50,000 BTU hob therefore suggests around 500 CFM. Gas cooking produces combustion byproducts in addition to grease and smoke, so the higher airflow is doing genuinely more work, not just moving more air for show.

Adjust upward for heavy cooking styles (frequent frying, wok cooking, searing), for island installations (no wall to help contain the plume — allow extra capacity), and for long or bend-heavy duct runs (which reduce effective airflow, so a higher-rated fan compensates). Adjustments downward are rarely wise; a hood with variable speeds can always run low, but an undersized hood cannot run high.

One caution: CFM ratings are measured under ideal laboratory conditions. Real installed performance is lower, affected by duct length, bends, and the exterior cap. This is another reason to size with margin rather than to the bare minimum — and to favour smooth, rigid ductwork over flexible duct, which creates turbulence and cuts airflow significantly.

Duct Sizing and Routing: The Details That Decide Performance

The ductwork matters as much as the fan. Undersized or poorly routed ducts strangle even a powerful hood. Key principles:

These routing decisions are exactly why ventilation belongs in the early planning conversation. Once kitchen cabinets are ordered and the layout is fixed, the duct route options narrow dramatically. Planning the hob position, the hood type, and the duct path together — before anything is built — avoids the all-too-common outcome of a beautiful kitchen with a hood that cannot breathe.

Mounting Heights and Capture: Position Matters

A hood can only capture what reaches it. Mounting height is the variable most often gotten wrong in real installations.

For gas hobs, the generally recommended mounting height is 24 to 30 inches above the cooking surface; for electric hobs, 20 to 24 inches is typical. Mount too high and the rising plume spreads beyond the canopy's capture area before it arrives — particularly problematic for island hoods with no wall assistance. Mount too low and the hood obstructs cooking, blocks sightlines, and in extreme cases creates a fire hazard with high flames.

Canopy size matters alongside height: the hood should cover the full hob area, and ideally extend slightly beyond it — an extra few inches of canopy on each side measurably improves capture. This is one reason chimney and island hoods outperform narrow under-cabinet models for enthusiastic cooks: the larger canopy forgives more plume spread.

Manufacturer instructions take precedence over general rules — always follow the specific clearances for your model, and check local building codes, which may specify minimum heights above gas burners.

Noise: Understanding Sones

A hood powerful enough for your cooking is no good if it is so loud you never switch it on — and this happens more often than manufacturers admit. Range hood noise is measured in sones: a lower number means quieter operation. As a rough guide, 1 sone is about as loud as a quiet refrigerator hum; normal conversation sits around 4 sones; a loud, cheap hood at full speed can exceed 8 or 9 sones, which is genuinely unpleasant to stand beneath.

Look for the sone rating at each fan speed, not just the maximum. A well-designed hood might move serious air at 3 to 4 sones on its working speeds, reserving a louder boost mode for occasional heavy searing. Variable-speed controls matter here: most daily cooking — simmering, sautéing, boiling — needs only low or medium speed, and a hood that is pleasant at those speeds will actually get used. The quietest installations also benefit from good ductwork: undersized or turbulent ducts create additional noise at the hood as the fan strains.

When comparing models, treat noise as a co-equal specification with CFM. A 600-CFM hood at 9 sones that you dread switching on performs worse in real life than a 400-CFM hood at 3 sones that runs every time you cook.

Make-Up Air: The Consideration Powerful Hoods Create

Here is a topic that surprises many homeowners: a powerful range hood does not just expel air — it depressurises the house. A 600+ CFM hood running at full speed pulls a large volume of air out of the building, and that air must be replaced from somewhere. In a tightly sealed modern home, the replacement air gets pulled from wherever it can: down chimneys and flues (potentially bringing combustion gases with it), through gaps around windows and doors, and from wall cavities.

This is why building codes in many jurisdictions require make-up air systems for hoods above a certain CFM threshold (commonly around 400 CFM, though requirements vary). Make-up air is a dedicated intake — often interlocked with the hood so it opens automatically when the fan runs — that supplies replacement air in a controlled way. It prevents backdraughting of fuel-burning appliances, reduces draughts, and lets the hood perform to its rating instead of straining against negative pressure.

If you are specifying a high-CFM hood, particularly in a well-sealed or recently renovated home, discuss make-up air during planning — not after the hood is installed and the dining room fireplace starts smoking every time you sear a steak. It is a routine part of professional kitchen ventilation design, and it is far easier to include from the start.

Planning Ventilation Into a Remodel: Before Cabinets Go In

Ventilation planning belongs at the very beginning of a kitchen project, alongside layout and services — not as a finishing touch. The sequence that avoids expensive rework:

  1. Fix the hob position first. Everything about ventilation — hood type, duct route, electrical supply — flows from where the hob sits. Moving a hob later means moving the hood, the duct, and the electrics.
  2. Choose ducted or ductless based on structure, not preference. If the building allows a clean duct route, ducted is the stronger choice. If it does not, commit to ductless early and budget for the filter maintenance honestly.
  3. Size the hood to the hob and the cooking. Apply the CFM rules of thumb, adjust for gas, island placement, and heavy cooking, and check the sone ratings.
  4. Route the duct on paper before walls close. Mark the exact path, count the bends, confirm the exterior termination point, and verify clearances with the cabinet plan. This is the step skipped most often and regretted most deeply.
  5. Coordinate with cabinet and worktop decisions. The hood's mounting height, canopy width, and any custom surround must align with the surrounding cabinetry. A kitchen planning guide that sequences these decisions saves real money.
  6. Plan electrics and make-up air together. The hood needs its supply, and high-CFM installations need the make-up air provision designed in — not improvised later.

Households working within a compact footprint should give ventilation the same early attention as any other element of a small kitchen remodel: small kitchens concentrate cooking effluent faster, so effective extraction matters at least as much there as in a large open kitchen.

A Local Angle: Cooking Styles and Older Homes in Kentucky and Ohio

Regional realities shape ventilation choices. Across Kentucky and Ohio — including Louisville, Lexington, and Columbus — two local factors deserve emphasis.

The first is cooking style. This is a region of serious home cooking: cast-iron searing, fried chicken, long-simmered dishes, big family meals cooked on gas. That style generates exactly the grease, smoke, and combustion byproducts that ducted extraction handles best. Households in Lexington that cook this way multiple times a week will feel the difference between ducted and ductless every single day — in air quality, in cleaning burden, and in how long cooking smells linger. If your household cooks like this, treat ducted as the default and ductless as the fallback.

The second is housing stock. Much of the housing across Columbus and the wider region dates from the early-to-mid 20th century, and older homes present characteristic ducting challenges: plaster walls that are costly to open, kitchens located deep in the floor plan far from exterior walls, low ceiling clearances, and in some cases, previous renovations that buried the straightforward duct routes. None of these make ducted impossible, but they make early planning essential — the duct route must be surveyed and confirmed before the remodel design is finalised, not discovered mid-project. In the trickiest cases — a galley kitchen in the centre of a 1920s home, for instance — a frank assessment may conclude that ductless, diligently maintained, is the honest answer. That is a legitimate outcome; what matters is reaching it deliberately rather than by default.

Conclusion

Ducted versus ductless is not a contest with a single winner — it is a matching exercise. Ducted extraction removes pollutants from the home entirely and is the stronger choice for frequent cooks, gas hobs, and heavy frying, provided the building allows a sensible duct route. Ductless recirculation offers flexibility where ducting is impractical, and performs respectably for lighter cooking when its filters are maintained on schedule. Around that central choice sit the details that decide real-world performance: correct CFM sizing, proper ductwork, sensible mounting height, tolerable noise levels, and make-up air for powerful installations.

The thread connecting all of it is timing. Ventilation planned before cabinets are ordered and walls are closed is straightforward; ventilation retrofitted afterwards is compromise. If you are planning a kitchen project and want the ventilation designed properly from the start, you can reach us at (607) 389-0071 to talk through what your kitchen's structure and cooking style actually call for.

Frequently Asked Questions

Which is better: ducted or ductless range hood?

For most households that can accommodate ductwork, ducted is better — it expels grease, smoke, moisture, and combustion byproducts outside the house rather than filtering and recirculating them. Ductless is the right choice where ducting is structurally impractical (flats, interior kitchens, rentals) or for light-cooking households, provided the charcoal filters are replaced on schedule.

How many CFM do I need for my range hood?

Two rules of thumb: allow 100 CFM per linear foot of hob width (so a 30-inch hob suggests around 250 CFM), or for gas hobs, 100 CFM per 10,000 BTU of total burner output. Size upward for island installations, heavy frying, and long duct runs. A hood with variable speeds can always run low; an undersized hood cannot run high.

How often do ductless range hood charcoal filters need replacing?

It depends on cooking frequency, but with regular daily cooking, charcoal filters typically saturate within a few months and need replacing to keep odour absorption working. A saturated filter recirculates air without meaningfully cleaning it. Treat filter replacement as a scheduled maintenance task, not an optional extra.

Can you convert a ductless range hood to ducted later?

Many hoods are sold as convertible and can be switched from recirculating to ducted mode, but the conversion still requires installing the full duct run to the exterior — the disruptive part of the job. If you think you may want ducted eventually, it is far easier to install the ductwork during the initial remodel while walls are open.

What is the correct mounting height for a range hood?

General guidance is 24 to 30 inches above a gas hob and 20 to 24 inches above an electric hob, but always follow the manufacturer's specified clearances and local building codes first. Mounting too high lets the cooking plume spread beyond the canopy; mounting too low obstructs cooking and can be a safety issue.

Do I need make-up air for my range hood?

If you are installing a high-CFM hood (commonly above 400 CFM, though thresholds vary by jurisdiction), building codes often require a make-up air system to replace the air the hood expels. Without it, a powerful hood can depressurise a tightly sealed home and cause backdraughting of fuel-burning appliances. Discuss it during planning, not after installation.

Is a downdraft vent as good as an overhead range hood?

Generally no for heavy cooking. Heat and smoke naturally rise, so capturing them from below works against physics and requires strong airflow. Downdraft systems suit light-to-moderate cooking where an overhead hood is impractical — for example, preserving sightlines on an island — but enthusiastic cooks will get better results from a properly sized overhead hood.