Ducted vs Ductless Range Hoods: A Scenario Walkthrough

The Core Difference: Where the Air Goes

When choosing between ducted and ductless range hoods, the fundamental difference is the path the air takes after it leaves your cooktop. A ducted hood captures smoke, steam, and airborne grease and pushes them through a metal duct that exits through your roof or an exterior wall. This means the air, along with the pollutants, is completely removed from your home.

A ductless range hood, also called recirculating, pulls the same air but passes it through filters—typically a mesh grease filter and a charcoal filter—before blowing the cleaned air back into the kitchen. The air is not expelled; it is recycled. This is a critical distinction because it affects not only how well the hood removes odors and moisture but also where you can install it and how much maintenance it requires.

For most homes, the choice comes down to whether you can physically install ductwork. If your kitchen is on an interior wall or in an apartment, ductless may be your only option. But if you have access to an exterior wall or roof, ducted offers superior performance. The trade-off is between installation flexibility and air-cleaning effectiveness.

Worked Example: A Weeknight Stir-Fry in a Condo Kitchen

Let’s walk through a concrete scenario. Maria lives in a third-floor condo with a kitchen on an interior wall. She loves making stir-fries and searing fish. She is deciding between a ducted hood (which would require running ductwork through her ceiling and out the roof) and a ductless hood that mounts under her cabinet.

On a typical Tuesday, Maria heats a cast-iron skillet to high heat, adds oil, and tosses in garlic, ginger, and chicken. The pan smokes immediately. With a ducted hood rated at 600 CFM (cubic feet per minute), that smoke is pulled up, through the duct, and out the roof vent within seconds. The smoke doesn’t have time to settle on her cabinets or trigger her smoke alarm. The kitchen stays clear, and the smell of garlic doesn’t linger into her living room.

Now, consider the same meal with a ductless hood. The fan pulls the smoke through a metal mesh filter that catches grease, then through a charcoal filter that absorbs some odors. The cleaned air is blown back into the kitchen. However, the charcoal filter has a finite capacity. After a few months of regular use, it becomes saturated and stops absorbing odors effectively. Maria notices that the smell of fish and oil lingers longer, and a fine film of grease starts to appear on nearby surfaces because the mesh filter only captures larger particles. The hood is working, but it’s not removing moisture or odors as thoroughly as a ducted system would.

Performance Metrics: CFM, Filtration, and Air Quality

The effectiveness of any range hood is measured in CFM—the volume of air it moves per minute. For ducted hoods, higher CFM (400–600+) is common because the fan must overcome the resistance of the ductwork. For ductless hoods, CFM is often lower (100–400) because the air path is shorter, but the charcoal filter adds resistance that reduces actual airflow. A ductless hood with a 300 CFM rating may perform more like 200 CFM in practice once the filter is in place.

Filtration is where ductless hoods have a distinct maintenance requirement. The metal mesh filter catches grease and should be cleaned monthly (often in a dishwasher). The charcoal filter, which removes odors, cannot be cleaned and must be replaced every 3 to 6 months, depending on cooking frequency. Replacement filters cost between $10 and $30 each, adding to the long-term cost. Ducted hoods have no charcoal filter; the grease filter is the only component that needs cleaning, and there’s no odor filter to replace because odors are simply vented outside.

From an indoor air quality perspective, ducted hoods are superior because they remove moisture, which helps prevent mold and mildew, and they eliminate combustion byproducts like nitrogen dioxide and carbon monoxide from gas stoves. Ductless hoods with charcoal filters can reduce some odors and particulates, but they do not remove moisture. If you have a gas stove, a ducted hood is strongly recommended for health reasons, as recirculating hoods cannot fully remove the pollutants produced by gas combustion.

Installation Realities: Duct Runs, Costs, and Retrofits

The installation cost difference is significant. A ducted hood requires ductwork, which can range from $200 to $500 for basic materials, plus professional labor. If you need to run duct through cabinets, ceilings, or multiple floors, costs can exceed $1,000. A ductless hood is often cheaper to install because it doesn’t require ducting—just a power source and mounting. However, if you’re converting a ductless hood to ducted later, you’ll face the same installation costs.

Consider the physical constraints. Ducted hoods need a path to the outside, ideally with smooth, straight ductwork (not ridged flexible hose, which restricts airflow and collects grease). The shorter and straighter the run, the better. A common rule is to keep duct length under 25 feet, with each 90-degree turn adding about 5 feet of equivalent length. If your kitchen is on an interior wall, you might need to route duct through the attic and out the roof, which is more complex and expensive than a direct wall vent.

Ductless hoods are more forgiving. They can be installed almost anywhere, including under cabinets, on walls, or as a slide-out unit. This makes them a practical choice for apartments, condos, or older homes where retrofitting ductwork is impractical. However, if you have the option to install ducting, the performance and health benefits usually justify the higher upfront cost. For a kitchen renovation, choosing ducted from the start is often the better long-term investment, even if it costs more initially.

Noise, Maintenance, and Long-Term Practicality

Noise is a factor often overlooked. Ducted hoods, especially higher-CFM models, can be loud. But because the fan is more powerful, you can run it on a lower setting and still move the same air volume as a ductless hood on high. Ductless hoods tend to be quieter at the same CFM because the motor is smaller, but they often need to run on high to be effective, which can be noisy. The best approach is to look for a hood with a sone rating (a measure of loudness) below 3 for quiet operation.

Maintenance routines differ. Ducted hoods require cleaning the metal grease filter every 1–2 months, depending on use. That’s it. Ductless hoods require the same grease filter cleaning, plus regular replacement of the charcoal filter. If you cook a lot, you’ll be buying new charcoal filters several times a year. Over 5 years, the cost of replacement filters can add $150–$300 to the price of a ductless system, narrowing the initial price gap.

Think about your cooking habits. If you rarely fry or sear, and you cook mostly with low heat, a ductless hood might suffice. But if you regularly cook foods that produce smoke, steam, or strong odors, a ducted hood will keep your kitchen cleaner and your air healthier. In the end, the choice is not just about the hood itself, but about your home’s layout, your budget, and how you cook. For many, the answer is a ducted hood if at all possible, with ductless as a practical fallback.