An extractor fan or cooker hood is the primary mechanical device in a kitchen designed to remove airborne grease, combustion products, smoke, odors, and heat from the air above your cooktop. Properly sized ventilation is essential for indoor air quality and prevents grease buildup on cabinetry and walls.
⚡ In a Rush? Key Takeaways
- Standard kitchen ventilation should move between 300 and 600 cubic feet of air per minute (CFM).
- Ducted systems are 30-40% more effective at moisture removal than recirculating carbon filter models.
- Modern low-noise hoods operate under 60 decibels, significantly quieter than models from a decade ago.
- Clean or replace your grease filters every 30 days to maintain peak suction performance and fire safety.
- ✅ Best long-term value is a ducted stainless steel hood with a multi-speed motor.
Which Type of Kitchen Exhaust System Do You Need?
Kitchen exhaust systems are primarily divided into ducted units that vent outside and recirculating units that clean air through filters.
What Are the Advantages of Ducted Ventilation?
Ducted systems channel grease and moisture directly outdoors, offering the highest level of air purification and odour control.
Ducted ventilation is the gold standard for high-performance kitchens. By physically moving air outside your home, you eliminate the source of cooking odours rather than just masking them.
If you perform high-heat searing or frying regularly, this is the most efficient choice. Maintaining your kitchen systems requires choosing hardware that can handle your specific cooking volume.
- Removes 100% of moisture, preventing cabinet mould.
- Requires professional installation through an exterior wall or roof.
- Generally quieter as the motor can be mounted further away.
- No ongoing cost for expensive replacement charcoal filters.
When Should You Choose a Recirculating Hood?
Recirculating hoods use charcoal filters to trap smells and grease before blowing the cleaned air back into your kitchen space.
These models are essential for apartments or kitchens where exterior venting is architecturally impossible. They rely on multi-stage filtration to manage particulate matter.
However, you must be disciplined with maintenance. If filters remain clogged, the motor strains, eventually causing the unit to fail prematurely.
How Do You Calculate the Correct CFM Power?
Proper extraction power is measured in cubic feet per minute, with a general requirement of 100 CFM per 10,000 BTUs of stove output.
Why Does Motor Power Matter for Your Kitchen?
A motor that is too weak will allow grease to settle on surfaces, while a motor that is too powerful can backdraft your boiler.
Many homeowners assume “higher is always better,” but professional-grade fans can sometimes draw too much air. This can interfere with gas appliance combustion or create negative air pressure.
Always verify the total BTU output of your range before purchasing. If you are upgrading your appliance intelligence, ensure your ventilation matches your stove’s output.
| Range Type | Recommended CFM |
|---|---|
| Electric Cooktop | 300-400 CFM |
| Gas Range (Standard) | 400-600 CFM |
| Professional/Griddle | 600-1200+ CFM |
How Can You Reduce Fan Noise While Cooking?
Quiet operation is achieved through larger duct diameters, high-quality motor mounts, and selecting variable-speed fan settings.
Noise levels are measured in sones, where 1 sone is equivalent to the sound of a refrigerator hum. A typical hood should stay below 4-5 sones on normal settings.
Avoid cheap, thin metal hoods that vibrate at high speeds. Sturdy construction is a key indicator of energy efficiency and long-term mechanical reliability.
How Should You Maintain Your Cooker Hood?
Routine maintenance involves cleaning metal grease filters monthly and replacing carbon filters every three to six months of use.
What Is the Best Way to Clean Grease Filters?
Most modern stainless steel mesh filters are dishwasher safe and can be cleaned using a degreasing detergent on a high-heat cycle.
Never run a hood without filters installed. This risks pulling grease into the internal motor assembly, which is nearly impossible to clean once contaminated.
If you don’t have a dishwasher, soaking the filters in hot water and a concentrated dish soap for 20 minutes is equally effective.
How Can You Tell If Your Filters Need Replacing?
Carbon filters lose effectiveness after approximately 120 hours of cooking, resulting in a noticeable decline in odour removal.
Monitor the airflow suction at the hood periodically with a simple tissue test. If the tissue is not held firmly against the grate, it is time to check your filters.
Frequently Asked Questions
Are black extractor fans harder to keep clean than stainless?
Black extractor fans often show dust and grease smudges more clearly than stainless steel and require daily wipedowns to look new.
Can I install a range hood myself?
Installation is possible for an experienced DIYer, but electrical and ducting work often requires a professional to ensure safety.
Do I need a cooker hood if I have a window?
A window is not a substitute for a hood because it cannot capture grease, steam, or smoke directly at the source of cooking.
How long should a standard cooker hood last?
A well-maintained range hood should provide ten to fifteen years of reliable service before the motor begins to lose efficiency.