Short answer: Solid-fuel cooking creates combustion gases, smoke, soot, sparks, grease and strong odour. The design normally needs specialist appliance and ventilation input, with appropriate capture, duct construction, fire precautions, particulate treatment, gaseous odour control, discharge and frequent cleaning. Carbon monoxide risk must be managed independently of smell.
Odour filtration cannot make unsafe combustion acceptable. The appliance manufacturer’s flue or canopy requirements, HSE carbon-monoxide guidance, fire strategy and BESA kitchen ventilation specification all matter. Some appliances require a dedicated exhaust route and should not simply share a grease duct with other equipment.
Important: This guide explains design questions; it is not a product selection, planning approval or performance guarantee. A competent designer should assess the actual kitchen, air system, discharge and maintenance conditions.
Combustion and carbon monoxide
Solid fuel can continue producing carbon monoxide after visible flames reduce. Extraction must operate for the required period and the fuel must not be used when ventilation is unavailable. Suitable detection, operating procedures and competent design are essential. Smell is not a reliable warning for carbon monoxide.
- Follow appliance fuel and loading instructions.
- Provide suitable ventilation and shutdown procedures.
- Use carbon-monoxide detection as designed.
- Train staff for residual-fuel and closing procedures.
Smoke, soot and sparks
Particulate loading can be much higher than a light-duty kitchen. Treatment equipment must be suitable for temperature, soot and possible sparks. Grease and soot together create a serious cleaning burden. Specialist high-temperature pre-filtration or fire measures may be required before an ESP or odour stage.
- Assess maximum exhaust temperature.
- Review spark and ember risk.
- Provide robust cleanout access.
- Coordinate fire suppression and duct strategy.
Odour and dispersion
Charcoal and wood smoke can be highly recognisable to neighbours. Fine particulate control may be combined with carbon or other gaseous treatment, but a high-level discharge and adequate dispersion remain important. Close receptors or low-level terminals can make planning acceptance difficult.
- Complete EMAQ+ style risk assessment.
- Model real operating hours and fuel use.
- Select treatment for smoke and odour separately.
- Document terminal location and maintenance.
What the observation may be telling you
| Observation | What it may mean | Correct next step |
|---|---|---|
| Charcoal oven added to existing canopy | Original airflow/fire/treatment design may be invalid | Stop and obtain specialist redesign |
| Visible sparks in duct | Fire and equipment-damage risk | Use suitable spark/temperature controls |
| CO alarm activates | Potential immediate life-safety hazard | Follow emergency procedure and stop use |
| Heavy soot at filters | Cleaning interval or treatment inadequate | Inspect complete extract and appliance operation |
| Strong smoke odour at neighbours | Treatment/dispersion insufficient | Review risk, system performance and discharge |
A practical odour-control workflow
Odour control is a chain of source control, capture, particulate removal, gaseous treatment, dispersion and maintenance. The weakest link can dominate what a neighbour experiences. Use a documented process so the proposed equipment relates to the actual kitchen and receptor risk.
- Characterise the cooking. Record menu, appliances, fuel, peak production, operating hours and likely changes. Separate grease and smoke problems from gaseous odour, because one treatment stage rarely controls every fraction equally.
- Assess the site risk. Map the duct route, proposed discharge and nearby windows, terraces, air intakes and residences. Consider frequency and duration of exposure as well as distance. Capture planning or environmental-health requirements verbatim.
- Design the complete sequence. Protect carbon or oxidation stages with suitable grease and particle removal. State airflow, contact or exposure basis, temperature and humidity limits, pressure loss, alarms, interlocks and safe access.
- Operate to evidence. Commission the complete system and retain baseline readings. Log cell cleaning, lamp hours, carbon changes, fan checks and complaints. If an odour returns, the timeline helps separate a maintenance failure from an under-designed system or a changed menu.
Keep a useful record: The handover file should identify media type and mass, cell configuration, lamp details, design airflow, clean pressure readings, replacement criteria, safe isolation and the route for removing contaminated components. A vague instruction to “service annually” is not a useful odour-management plan.
Project or service checks
- Obtain manufacturer exhaust/flue requirements.
- Confirm whether a dedicated system is required.
- Include CO risk assessment and detection strategy.
- Coordinate fire, temperature and spark controls.
- Select ESP/filters for the actual smoke and soot duty.
- Provide high-level discharge where practicable.
- Set a cleaning frequency from inspection and use.
Turn the agreed checks into named deliverables. Each item should have an owner, due date and acceptance method. Where a measurement is required, record the value, unit, instrument or source, operating condition and result. This makes the information usable at handover and during a later investigation.
Common mistakes to avoid
- Adding charcoal equipment without redesign.
- Treating odour control as the only risk.
- Connecting to a duct or filter not rated for the duty.
- Turning extraction off while fuel remains active.
- Using standard kitchen cleaning intervals without inspection.
Avoid closing the issue on appearance alone. A new filter, reset controller or revised drawing may change the symptom without resolving the underlying duty, utility, access or maintenance problem. Confirm the completed work under a representative operating condition and keep the evidence with the asset or ventilation record.
Frequently asked questions
Can a charcoal oven share the same extract as gas appliances?
Do not assume so. Manufacturer, fire and ventilation requirements may call for separate capture or ducting; a competent specialist must decide.
Will an ESP remove wood smoke smell?
It can reduce fine particles, but gaseous smoke odour may remain and require additional treatment and dispersion.
Is CO controlled by a carbon odour filter?
No. Carbon-monoxide safety requires proper combustion ventilation, operation and detection—not an odour filter.
Related Kitchen Install Guide reading
- Commercial Kitchen Equipment Duty Categories
- Commercial Kitchen Odour-Control Systems Guide
- Where Should a Commercial Kitchen Extract Duct Discharge?
Plan the whole commercial kitchen, not one isolated component
Use the Commercial Kitchen Install Guide to coordinate extraction, equipment, utilities, drainage, safety, access and handover before work reaches site.
Sources and further guidance
- HSE: Catering and hospitality technical publications
- HSE: Ventilation of kitchens and catering establishments
- BESA: DW/172 Specification for Kitchen Ventilation Systems
- EMAQ+: Control of Odour and Noise from Commercial Kitchen Exhaust Systems
Last reviewed: 14 August 2026. This article provides general commercial-kitchen design information. It does not replace a site-specific ventilation design, manufacturer instructions, risk assessment, planning conditions or advice from a competent specialist.