For homeowners choosing an induction hob with an integrated extractor (extractor hob), one of the most important decisions is how the extracted air should be handled.

Should the appliance be connected to an external extraction duct, allowing cooking vapour and odours to leave the building? Or is a recirculating system a better choice, filtering the air and returning it to the kitchen?

There is no universal winner. The better option depends on your kitchen layout, property type, installation possibilities, cooking habits, and whether creating a new ventilation route is practical.
This is particularly relevant in Europe, where many kitchens are located in apartments, renovated properties, or open-plan living spaces where installing a new external duct can be difficult or restricted. For these homes, recirculation can offer a much simpler installation without sacrificing the space-saving benefits of an extractor hob.
In this guide, we compare ducted and recirculating induction hobs across the factors that matter most to European homeowners: installation, extraction performance, airflow, odour removal, heat loss, energy consumption, maintenance, filter replacement, renovation requirements, and apartment suitability.

Ducted vs Recirculating Induction Hob: At a Glance

What Is the Difference Between Ducted and Recirculating Extraction?

Before comparing the two systems, it is important to understand what happens to the air after it is captured.

Ducted Extraction

A ducted induction hob with extractor captures cooking vapour, smoke, grease and odours at the cooking surface and then transports the extracted air through a duct to the outside.

The basic airflow path is:

Cooking vapour → Integrated extractor → Grease filter → Duct → Outside

Because the extracted air leaves the property, there is no need to return the filtered air to the kitchen.

Ducted extraction can therefore be particularly effective when a suitable external ventilation route already exists.

Recirculating Extraction

A recirculating induction hob with extractor captures the cooking air and passes it through filters before returning the cleaned air to the room.

The typical airflow path is:

Cooking vapour → Integrated extractor → Grease filter → Odour filter → Filtered air returned to kitchen

Depending on the appliance, this may involve activated carbon filters or more advanced purification technologies.

The major advantage is installation flexibility: you do not necessarily need a duct leading outside.

1. Installation: Which System Is Easier to Install?

Installation is often the first major difference homeowners notice.

Ducted Extraction

A ducted system needs a route for air to travel from the extractor to the exterior of the building. Depending on the kitchen design, this could involve:

• Existing ventilation ductwork
  
• A wall outlet
  
• A floor or ceiling route
  
• Cabinet modifications
  
• Additional ducting and connectors

The duct route should also be designed carefully. Excessive bends, long duct runs or undersized ducting can restrict airflow and increase noise.

For a new kitchen where ductwork has already been planned, this may not be a significant problem. However, retrofitting a ducted system into an existing kitchen can be considerably more complicated.

Recirculating Extraction

Recirculation does not require an external exhaust route. The air is filtered inside the appliance and returned to the room.

This can make installation much easier, particularly when the kitchen has limited space beneath the worktop or when creating an external outlet is impractical.

2. Extraction Performance: Is Ducted Always Better?

Ducted extraction has an inherent advantage because the extracted air is physically removed from the building.

When correctly installed, it can continuously discharge:

• Steam
  
• Cooking vapour
  
• Smoke
  
• Grease particles
  
• Odour-containing air

However, real-world performance depends heavily on the installation. A poorly designed duct system can significantly reduce the airflow that actually reaches the outside.

Recirculating systems work differently. They must first capture the cooking air and then filter it before returning it to the room.

This means the quality of the grease and odour filtration system becomes particularly important.

For example, an induction hob with extractor using advanced odour filtration can provide effective everyday cooking ventilation without requiring an external duct.

Beyond basic charcoal filters, modern systems incorporate several advanced technologies:
UV-C Disinfection: Kills bacteria, mold, and viruses passing through the airflow, preventing microbial growth and secondary odors inside the unit.

Plasma⁺ Technology: Generates positive and negative ions to break down odor molecules and grease micro-particles into harmless water and CO2.

Photocatalytic (TiO₂) Oxidation: Uses UV light with titanium dioxide to actively decompose VOCs and complex organic compounds instead of just trapping them.

3. Airflow: Where Does the Extracted Air Go?

Airflow is another important difference.

With ducted extraction, the extractor moves air through the appliance and then through the duct system. The final airflow depends not only on the extractor's rated capacity but also on factors such as:

Duct diameter
Duct length
Number of bends
Outlet design
Installation quality

A high airflow rating therefore does not automatically mean that the same airflow will be achieved in every installation.

With recirculation, there is no external duct pressure loss. However, air must pass through the filtration system, which creates its own resistance.

This is why consumers should not compare airflow figures alone. The complete extraction system—including ductwork or filters—determines real-world performance

4. Odour Removal: Which Is Better for Everyday Cooking?

Odour removal is especially important in European open-plan kitchens, where the kitchen often shares the same space as the dining and living areas.

A ducted system removes odour-containing air from the room and exhausts it outdoors. This makes it particularly effective for strong-smelling cooking.

A recirculating system relies on filtration to remove odours before the air is returned.

Activated carbon or other odour filtration technologies can capture many cooking smells, but filters have a finite capacity and need to be maintained or replaced according to the manufacturer's recommendations.

For households that frequently cook strongly aromatic foods, ducted extraction can therefore have an advantage.

For normal everyday cooking, however, a well-designed recirculating system can be a highly practical alternative, and choosing a high-quality recirculating filtration system is essential.

You might be interested in: Recommendations for high-quality plasma⁺ filter systems. Click to view their working principles.

5. Heat Loss: Does Ducted Extraction Waste Heat?

This is an often-overlooked difference.

When a ducted extractor removes indoor air, that air is replaced by air entering the property from elsewhere. In a heated home during winter, the extracted air has already been warmed.

In summer, the same principle applies to cooled indoor air.

This means ducted extraction can contribute to ventilation-related heating or cooling losses, particularly when used frequently at high airflow.

Recirculating extraction keeps the air inside the building after filtration, so it does not continuously discharge conditioned indoor air outdoors.

For energy-conscious households, especially in climates with significant heating requirements, this can be an attractive advantage.

Which Uses Less Energy?

The energy consumption of the extractor itself is only part of the equation.

Both systems require electricity to operate the extractor fan. However, ducted extraction can also indirectly affect household energy use because conditioned indoor air is discharged outside.

Recirculation avoids this particular source of ventilation-related heat loss.

Therefore, if two systems provide similar cooking-air capture performance, a recirculating solution may be attractive for homeowners who want to minimise unnecessary loss of heated or cooled air.

If you'd like to explore how to save money on induction cooktops and range hoods, please click to view this article. How a Hob with a Built-in Extractor Saves Money

6. Filter Replacement: An Ongoing Cost to Consider

Filter replacement is one of the most important practical considerations when choosing recirculation.
A grease filter is designed to capture grease particles generated during cooking. Depending on the design, it may be washable and reusable.

An odour filter, such as an activated carbon filter, works differently. Over time, its odour-absorbing capacity decreases, and it may need to be replaced or regenerated, depending on the technology used.
This creates an ongoing ownership cost that should be considered when comparing the two systems.

By contrast, ducted extraction can reduce dependence on replaceable odour filters because the odour-containing air is discharged outdoors.

If you choose recirculation, it is worth looking for advanced maintenance-free options. For instance, the CIARRA ONE series features innovative Plasma technology that eliminates the need for filter replacements, saving you from recurring costs and routine hassle.

7. Is Recirculation Better for Apartments?

For many European apartment owners, this is perhaps the most important question.
An apartment may not have:

1. A suitable external wall
   
2. A dedicated kitchen exhaust duct
   
3. Permission to create a new external outlet
   
4. Sufficient space for conventional ductwork
   
5. The ability to modify the building facade
   

There may also be building-management, landlord or planning restrictions on creating new penetrations through external walls.
In these situations, recirculation can be much more practical.
Instead of asking:
"Where can I install the exhaust duct?"
you can focus on:
"How effectively can the appliance filter and return the air?"
This is one reason recirculating induction hobs with integrated extractors are particularly relevant to apartments, renovated kitchens and compact European homes.

So, Which Is Better: Ducted or Recirculating?

There is no single answer.

Ducted extraction is generally the stronger choice for maximum removal of cooking air, provided that a properly designed external ventilation route is available.

Recirculating extraction is often the more practical choice for European apartments, renovations and kitchens where external ducting is restricted or inconvenient.

The important point is that choosing recirculation does not mean choosing an inferior kitchen solution. Modern induction hobs with integrated extractors can combine effective grease filtration with dedicated odour filtration and, depending on the model, additional air-purification technologies.

For many homeowners, the decision ultimately comes down to a simple question:

Do you have a practical, permitted route to exhaust air outside, or would a high-quality filtration system be a simpler solution for your kitchen?

If external ducting is straightforward, ducted extraction is usually the preferred option for maximum extraction performance. If ducting would require major renovation—or is not possible at all—recirculation can offer a much more flexible and apartment-friendly alternative.

For products such as the CIARRA ONE induction hob with extractor, this distinction is particularly important when planning the installation. Understanding the two extraction modes before purchasing can help you avoid unnecessary renovation work while choosing a ventilation setup that fits your home, cooking habits and long-term maintenance expectations.