Kitchen Extractor Fan Not Pulling Any Air Through

If your kitchen extractor fan is running but steam, cooking smells and smoke are still hanging around, the problem is usually airflow rather than the whole appliance being beyond repair. A fan can sound as if it is working while clogged filters, blocked ducting or a weak motor stop it pulling air through properly.

Start with the simple checks you can do safely. If those do not improve the suction, the next step is to work out whether you need a ventilation and AC engineer, an electrician or another trade. This guide explains the most common causes, what to avoid and how to describe the job when you ask for quotes.

First, check what type of extractor you have

Kitchen extractors usually work in one of two ways. A ducted extractor pulls air through the hood and sends it outside through a wall, roof or duct run. A recirculating extractor pulls air through grease and charcoal filters, then blows it back into the room.

This matters because a recirculating hood will not push air outside, even when it is working correctly. If you are expecting to feel air at an outside vent but the unit was set up to recirculate, the fan may not be faulty at all. It may simply need fresh filters and better general ventilation, such as opening a window while cooking.

Look for an outside grille on the wall, a duct going through a cupboard above the hood or a switchable setting in the manual. If you have just moved into the property, do not assume the visible hood is ducted. Many flats and rented homes use recirculating extractors because ducting to an external wall is not always practical.

Safe checks to try before calling someone

Before touching the extractor, turn it off at the switch and let it cool. Do not put fingers, cloths or tools near moving fan blades. If the unit is hardwired and you suspect an electrical fault, stop there and call an electrician.

You can still carry out a few basic checks without dismantling anything:

• Check the speed setting and isolator switch: Some cooker hoods have a separate wall switch or fused spur nearby. If the lights work but the fan does not, the control or fan motor could still be faulty.
• Clean the grease filters: Metal mesh filters can become packed with grease, which restricts airflow. Wash them according to the manufacturer’s instructions, often in hot soapy water or a dishwasher if suitable.
• Replace charcoal filters if fitted: Recirculating extractors often use charcoal filters that lose effectiveness over time. Many manufacturers suggest changing them every few months, depending on use.
• Check the outside vent from ground level: If it is safe to see the grille, look for a stuck flap, leaves, cobwebs or obvious obstruction. Do not climb ladders or remove external covers if you are unsure.
• Try opening a window slightly: Extractors need replacement air to enter the room. In very airtight homes, suction can feel weak unless there is a small source of fresh air.

A simple tissue test can help, but keep it away from any moving parts. Hold a light piece of tissue near the intake grille while the fan is running. If it barely moves after the filters have been cleaned, you are likely dealing with a ducting, installation or motor issue.

Common reasons a kitchen extractor fan is not pulling air

The table below gives a practical way to match the symptom to the likely cause and the trade you may need.

For most airflow faults, especially where ducting is involved, a ventilation and AC engineer is usually the best first call. If the fan has no power, smells hot or the controls are faulty, compare local prices on HaMuch’s electrician rates page before booking electrical work.

Filters are the easiest problem to rule out

A blocked grease filter is one of the most common reasons an extractor fan is not working as expected. Cooking oils cool as they rise, then stick to the mesh filter. Over time, that layer of grease restricts airflow and makes the fan work harder.

If your extractor has metal filters, remove them carefully and check whether light passes through the mesh. If they feel sticky or look dark, clean them and let them dry fully before refitting. Paper, foam or charcoal filters normally need replacing rather than washing, unless the manual says otherwise.

Keeping filters clean also reduces fire risk. The London Fire Brigade includes extractor fans and filters in its advice on keeping cooking areas free from grease build-up. If you cook often, especially frying or searing, filter maintenance is not just about smells. It helps the appliance work safely and efficiently.

Ducting problems can make a working fan feel useless

If the fan sounds normal but hardly any air leaves the building, the problem may be somewhere between the hood and the outside vent. Ducting can become crushed behind cupboards, disconnected during refit work or blocked by debris at the outlet.

Long duct runs can also reduce performance, especially if they have several bends. Flexible ducting that sags or folds sharply can restrict airflow much more than homeowners expect. In some kitchens, the hood has been connected to ducting that is too narrow for the fan, making the unit noisy but ineffective.

A ventilation engineer can check whether the duct route is clear, correctly sized and safely terminated outside. If you are in London, Birmingham, Manchester or a surrounding town, labour availability and rates can vary noticeably, so it is worth comparing local tradespeople rather than accepting the first estimate.

Electrical faults need a qualified electrician

If the extractor fan is completely dead, only the light works or the fan makes a humming sound without spinning, it may be an electrical or motor fault. Cooker hoods are often connected through a fused spur or wired into the kitchen circuit, so this is not a job to guess at.

Switch the fan off if you notice any of these warning signs:

• A burning smell from the hood or switch
• A hot or discoloured control panel
• Buzzing from the switch, fused spur or appliance
• The fan cutting in and out unpredictably
• Tripping electrics when the fan is turned on

An electrician can test the power supply, switch, fuse and wiring, then advise whether the fan itself needs repair or replacement. For landlords, a faulty hardwired extractor should be dealt with promptly, particularly if tenants are reporting damp, smells or electrical symptoms.

If there is any smell of gas near the hob, boiler or meter, do not use the extractor, light switches or flames. Leave the property, call the National Gas Emergency Service on 0800 111 999 and follow Gas Safe Register gas emergency advice. After the emergency has been made safe, use a Gas Safe registered engineer for gas appliance checks.

Poor installation can cause weak extraction from day one

Sometimes the extractor fan has never pulled properly. This is common after kitchen refurbishments where the visible hood looks fine but the hidden ducting is an afterthought.

A few installation issues can cause poor extraction:

• The hood is too high above the hob
• The duct has too many bends
• The duct outlet is blocked by a flap that cannot open fully
• The fan is set to recirculate when the homeowner expected external extraction
• The kitchen has no easy source of replacement air
• The extractor is too small for the way the room is used

A kitchen fitter may be needed if cabinets, boxing-in or the hood housing need altering. A ventilation and AC engineer is better placed to assess duct routes and airflow. An electrician may also be needed if the unit is being replaced or moved.

This is where comparing quotes helps. One tradesperson may quote to replace the hood, another may identify a simpler ducting problem. HaMuch is built to make those comparisons easier by showing real, transparent pricing and local reviews, not just a list of names with no cost context.

Should you repair or replace the extractor fan?

Repair is often sensible when the issue is a blocked duct, dirty filters, a failed switch or a loose connection. Replacement may be better if the unit is old, noisy, underpowered or needs parts that are hard to source.

If you are already planning kitchen work, it may be worth upgrading from recirculating extraction to ducted extraction where the layout allows. Ducted systems are usually better at removing moisture from cooking, which can help reduce condensation on windows, cupboards and walls. That said, not every home can be ducted easily, especially flats with internal kitchens or restrictions on external vents.

Ask the tradesperson to separate the quote into labour, parts and any making-good work. For example, replacing a built-in hood may involve electrical disconnection, fitting the new unit, adjusting a cabinet panel and checking the duct. Seeing the work broken down helps you compare quotes fairly.

What to tell the tradesperson when you ask for quotes

A clear description saves time and can help you get more accurate prices. When posting the job, include the type of extractor if you know it, whether air should vent outside and what changed before the problem started.

Helpful details include the brand and model, whether the light still works, whether the fan makes any noise, when the filters were last cleaned or replaced, and whether there is an outside grille. Photos are useful too, but take them from a normal distance rather than trying to photograph inside the appliance.

If you manage rental properties, mention whether the tenant is reporting condensation, mould, cooking smells in other rooms or a complete loss of power to the hood. These details help separate a cleaning issue from a ventilation or electrical fault.

How to avoid the same problem coming back

Once the extractor is working again, a little routine care goes a long way. Clean grease filters regularly, replace charcoal filters when needed and keep the area around the outside vent clear where it is safe to do so.

Try to use the extractor before steam builds up, not only after the kitchen is already full of moisture. Turning it on a few minutes before heavy cooking and leaving it running for a short time afterwards can help clear air more effectively. If the fan is ducted, listen for changes in noise. A sudden rattle, whistle or deeper hum can be an early sign of a loose cover, blocked duct or tired motor.

For landlords, keep a note of filter changes, repairs and tenant reports. Extractor issues can contribute to damp and mould complaints, so it is better to act early than wait until decoration, plaster or cupboards are affected.

Frequently Asked Questions

Why is my kitchen extractor fan not pulling air through? The most common causes are clogged grease filters, old charcoal filters, blocked or crushed ducting, a stuck outside vent flap or a weak fan motor. Start by cleaning or replacing filters, then call a ventilation engineer or electrician if airflow is still poor.

Who should I call if my extractor fan is not working? Call an electrician if there is no power, a burning smell, tripping electrics or faulty controls. Call a ventilation and AC engineer if the fan runs but does not pull air through or the ducting seems blocked. A kitchen fitter may be needed if cupboards or built-in housing need altering.

Can I keep cooking if the extractor fan is not working? You can usually cook with extra care if there is no electrical fault, no burning smell and no gas smell, but open windows and avoid creating lots of steam or smoke. If you smell gas, leave the property and call the National Gas Emergency Service on 0800 111 999.

How often should kitchen extractor filters be cleaned? Metal grease filters should be cleaned regularly, often monthly in busy kitchens. Charcoal filters in recirculating extractors normally need replacing every few months, but always follow the manufacturer’s instructions for your model.

Is weak suction always a sign I need a new cooker hood? No. Many suction problems are caused by dirty filters, blocked vents or poor ducting. A tradesperson can check whether the existing fan can be restored before you pay for a replacement.

Need your kitchen extractor checked?

If your kitchen extractor fan is not pulling air through after the basic filter checks, post the job on HaMuch. You can compare local tradespeople, see transparent pricing and read genuine customer reviews before deciding who to contact.

For airflow and ducting problems, ask for a ventilation and AC engineer. For power, switches, burning smells or a fan that will not spin, choose an electrician. If the issue feels urgent or unsafe, stop using the extractor and request help straight away.