When grease buildup suddenly creates smoke, dripping, strong odors, blocked drainage, or unsafe equipment, the first decision is whether you are facing an active life-safety emergency or a cleaning and maintenance emergency. Fire, smoke, suspected gas, electrical danger, injury, or an immediate threat to people requires emergency procedures and the appropriate emergency services, not a cleaning crew.
If there is no active danger, isolate the affected operation only when it is safe, keep people away from the area, and identify whether the problem involves the exhaust system, a grease trap, an appliance, or a rooftop fan. The right classification helps you arrange qualified help without making the hazard worse.
Quick summary
- Evacuate and contact emergency services for active fire, smoke, suspected gas, electrical hazards, serious injury, or an unsafe condition that cannot be isolated.
- For heavy grease buildup without an active emergency, pause affected equipment when safe and restrict access to hot, energized, moving, contaminated, or rooftop areas.
- Hood, filter, duct, fan, and rooftop grease problems require exhaust-system cleaning and maintenance. Slow drains, gurgling, odors, and overflow point toward grease-trap service.
- Do not mix chemicals, pour improvised products into drains, rinse grease without containment, or open operating equipment or exhaust components.
- Document symptoms, photos from safe locations, access details, prior service records, and inspection concerns before requesting professional assistance.
First decision: Is this an active emergency or a cleaning emergency?
A commercial kitchen should treat visible fire, smoke spreading through the exhaust path, suspected gas, exposed electrical danger, serious injury, or an immediate threat to staff or guests as an active emergency. Follow your site’s emergency plan, move people away from danger, and contact the appropriate emergency service. Do not delay that response while trying to remove grease.
A cleaning emergency is different. It may involve thick grease deposits, dripping from a hood or duct, persistent grease odors, reduced exhaust capture, a slow drain, a gurgling sink, or an overflowing interceptor without an active fire or other immediate life-safety event. These conditions still need prompt attention, but the response is controlled isolation, documentation, and qualified cleaning or maintenance.
Ontario’s Fire Code requires cooking operations that produce smoke or grease-laden vapours to have exhaust and fire-protection systems maintained in accordance with NFPA 96. That requirement makes maintenance important, but it does not turn a cleaning provider into an emergency authority or replace directions from firefighters, inspectors, utility providers, or other qualified officials. Read the applicable Ontario Fire Code provision for the regulatory wording.
What to do immediately when grease becomes a hazard
Use the following sequence for a non-active grease emergency. If any step would place someone near fire, smoke, gas, electricity, hot surfaces, moving machinery, contaminated wastewater, or an unsafe roof, stop and wait for qualified assistance.
- Pause the affected operation when safe. Stop using the appliance, hood section, sink, or drain involved if doing so does not create another hazard.
- Control access. Keep employees, customers, and delivery personnel away from slippery floors, leaking grease, hot equipment, and restricted mechanical areas.
- Protect food and service areas. Move exposed food away from contamination where this can be done safely. Pause affected preparation rather than working around an unsafe condition.
- Observe without intervening. Note where grease is visible, whether the exhaust fan is running, whether drainage is slowing, and whether odors or dripping are increasing.
- Document the condition. Take photographs from safe locations, record the time, identify affected equipment, and preserve recent cleaning, inspection, and repair records.
- Request the right help. Describe the symptoms clearly and ask for qualified cleaning or maintenance support. Use emergency services for fire, smoke, gas, electrical danger, or injury.
Identify where the grease problem is coming from
Grease in a commercial kitchen does not always mean the hood needs cleaning. Vapors travel through the exhaust path, while fats, oils, grease, and food solids collect in drainage equipment. Appliances and fan components create separate maintenance needs.
Exhaust-system grease: hood, filters, ducts, and fans
Look for deposits on the hood canopy, saturated filters, grease dripping from seams, strong odors near the hood or roof, reduced smoke capture, or residue around the exhaust fan. The affected path may extend from the hood and filters through vertical or horizontal ducts to the rooftop fan and grease containment area.
Cleaning only the visible hood may leave combustible deposits farther inside the system. A professional grease duct cleaning service can assess the full exhaust path and may use containment, filter cleaning, hood degreasing, mechanical scraping, appropriate rinsing, fan checks, and documentation.
Grease-trap or drainage emergency: overflow, odors, and slow flow
Slow sinks, gurgling drains, wastewater backing up, persistent odors near the dish area, visible grease around a trap lid, or overflow point toward a grease-trap or interceptor problem. Continued use of sinks and dishwashing equipment can worsen a restricted system.
Stop adding grease and food solids to the affected drain. Do not pour harsh or improvised chemicals into it. If reduced interceptor capacity or overflow is involved, grease trap cleaning may include pumping, scraping, inlet and outlet clearing, seal checks, flow testing, cleanup, and service reporting.
Appliance grease and rooftop fan problems
Grease around ovens, grills, fryers, or other commercial appliances can affect hygiene, operation, and safe access. It may require commercial appliance cleaning rather than exhaust cleaning alone. A refrigerator may need a different approach from a grill or oven, so identify the appliance and affected surfaces when requesting help.
A noisy, weak, stopped, or visibly contaminated exhaust fan may indicate an issue involving the fan, belt, hinge, motor, or grease containment. Do not open moving or energized equipment, climb onto a roof without proper access and training, or attempt belt replacement during operation.
Grease problem decision table
| Likely problem | Common signs | Immediate priority | Possible professional scope |
|---|---|---|---|
| Exhaust-system buildup | Grease on hood, filters, ducts, fan, or roof; dripping; poor capture | Pause affected cooking when safe and restrict access | Hood, filter, duct, fan, containment cleaning, testing, and documentation |
| Grease-trap issue | Slow drains, gurgling, odors, overflow, or wastewater backup | Stop adding wastewater and grease if safe | Pump-out, scraping, line clearing, seal checks, flow testing, and reporting |
| Appliance grease | Heavy residue on ovens, grills, fryers, or nearby surfaces | Keep hot or energized equipment out of service until safe | Commercial appliance cleaning and related ventilation assessment |
| Rooftop fan problem | Noise, weak airflow, stopped fan, belt concern, or grease around the fan | Do not access or open the fan without safe controls | Fan cleaning, belt-related maintenance, containment checks, and testing |
What not to do during emergency grease removal
Do not mix cleaning chemicals, use unapproved combinations, or pour harsh products into a drain. Do not rinse grease into a floor drain or onto a roof without suitable containment and recovery.
Do not scrape, pressure-wash, or open a hood, duct, fan, appliance, or electrical enclosure while it is hot, energized, moving, or operating. Do not send untrained staff onto a roof or into a mechanical space. Cleaning cannot resolve an active fire, gas leak, electrical fault, medical emergency, structural danger, or contamination event.
What qualified professional grease removal may include
For an exhaust problem, a controlled service may begin with a pre-inspection and system map covering the hood, duct routes, access panels, fan, and containment. The work area can then be protected, equipment shut down, and filters removed for cleaning or exchange. Hood surfaces and accessible duct sections may be degreased and mechanically scraped where deposits are heavy.
Depending on system and site conditions, the process may also include fan and hinge checks, rooftop containment protection, appropriate hot-water rinsing, wastewater recovery, final cleanup, and functional testing. A service report with photographs and observations provides a useful maintenance record.
Grease-trap work follows a different path. It may involve pump-out, manual scraping, clearing inlet and outlet lines, checking seals, testing flow, cleaning the surrounding area, and recording the service.
How to prepare for an urgent cleaning service call
- Describe symptoms: Explain whether the issue is dripping grease, buildup, reduced airflow, odor, slow drainage, gurgling, overflow, equipment noise, or a stopped fan.
- Identify the location: Note the hood, filter bank, duct, rooftop fan, appliance, floor drain, sink, trap, or interceptor involved.
- Record operational status: State whether cooking, dishwashing, drainage, or ventilation has stopped and whether equipment remains hot or energized.
- Share safe photographs: Take images from the floor or another safe position. Never enter a restricted area for a better view.
- Provide access information: Explain roof access, service doors, security procedures, operating hours, and escort requirements.
- Gather records: Have recent cleaning reports, inspection notes, repair records, equipment details, and previous concerns available.
Ontario compliance context: NFPA 96 maintenance
Ontario Regulation 213/07 connects commercial cooking operations that produce smoke or grease-laden vapours with exhaust and fire-protection systems maintained in accordance with NFPA 96. An emergency cleaning visit should therefore become part of a broader maintenance record, not the only action taken after buildup is discovered.
Cleaning documentation can show what was serviced, what conditions were found, and what follow-up was recommended. It is not a guarantee of inspection approval or legal compliance, and it does not replace directions from a local fire authority, inspector, insurer, landlord, or other responsible professional.
Prevent the next grease emergency
Have the exhaust path assessed and cleaned according to operating conditions and qualified recommendations rather than relying on a universal interval. High grease production, long operating hours, menu changes, and seasonal workload can affect how quickly deposits accumulate.
- Keep hood filters clean or exchange them when damaged, saturated, or no longer performing properly.
- Schedule full exhaust cleaning that considers the hood, ducts, fan, and grease containment.
- Monitor grease traps and drainage for odors, slow flow, gurgling, and changing grease or solids levels.
- Include commercial appliances in the cleaning plan, especially grills, ovens, and grease-exposed equipment.
- Check fan operation, belts, hinges, and containment during appropriate maintenance visits.
- Retain service reports, photographs, dates, observations, and follow-up recommendations in one accessible file.
Frequently asked questions
When should a commercial kitchen treat grease buildup as an emergency?
Treat it as an active emergency when there is fire, smoke, suspected gas, electrical danger, serious injury, or an immediate threat that cannot be safely isolated. Heavy buildup, dripping, odors, slow drainage, or reduced ventilation without those conditions is a prompt cleaning and maintenance issue.
Can kitchen staff clean a greasy hood or duct during an operating shift?
They should not clean hot, energized, moving, or operating equipment, or open ducts and access rooftops without appropriate qualifications and controls. Staff can report symptoms, protect the area, pause affected work when safe, and arrange qualified assistance.
How can I tell whether the problem is in the exhaust system or the grease trap?
Grease on hoods, filters, ducts, fans, or the roof, along with reduced capture or exhaust odors, points toward the exhaust system. Slow drains, gurgling, wastewater backup, or odors near sinks and dish areas point toward the trap or drainage system.
What information should I provide when requesting urgent grease removal?
Provide the affected location, symptoms, equipment status, safe photos, access restrictions, operating hours, recent service records, and inspection concerns. State clearly whether there is active fire, smoke, gas, electrical danger, injury, or contamination.
Does emergency grease cleaning by itself satisfy Ontario Fire Code requirements?
No. Ontario requires relevant exhaust and fire-protection systems to be maintained in accordance with NFPA 96, but one cleaning visit does not guarantee compliance or inspection approval. Keep documentation and confirm site-specific requirements with the relevant authority and qualified professionals.
Conclusion: Make the safe decision first
Emergency grease removal starts with classification, not chemicals or equipment. Active fire, smoke, gas, electrical, medical, or structural danger requires emergency procedures and the appropriate emergency service. A non-active grease problem still deserves prompt action, but the safest path is to isolate it when possible, keep people away, identify the affected system, and arrange qualified cleaning or maintenance.
Once the immediate condition is controlled, use the service record to prevent a repeat. Exhaust cleaning, filter care, fan and belt checks, appliance cleaning, grease-trap monitoring, and clear documentation should work together as one commercial kitchen maintenance plan.
Robinhood Cleaners serves Ontario with kitchen exhaust cleaning, filter cleaning or exchange, fan belt replacement, commercial appliance cleaning, grease trap cleaning, and related commercial kitchen services.