The objective of a kitchen range exhaust system is to capture moisture and airborne contaminants created during cooking, and vent them to the outside. The selection of an exhaust system is largely dependent on the size and type of range, and its intended use. Wall mounted hoods are the most common exhaust system used in the residential kitchen; however, island canopy hoods and downdraft systems have risen in popularity in recent years. The goal of an exhaust system specifier should be to provide an adequate, but not excessive, amount of exhaust without jeopardizing occupant safety or comfort. First, a homeowner or buyer should assess their cooking habits and select appliances based on need rather than a “bigger is better” mentality. Larger appliances demand more power and require larger exhaust systems leading to higher operation costs, and increased risk of house/hotel depressurization and associated hazards. In addition, every cubic foot of exhausted air is a cubic foot of makeup air that must be heated or cooled at the owner’s expense.
A kitchen exhaust system is the setup that removes smoke, heat, grease-laden vapours, odors, and airborne contaminants from a kitchen—especially in commercial settings. It helps keep the kitchen safe, comfortable, and compliant with fire-safety codes.
Below is a clear breakdown:
Main Components of a Kitchen Exhaust System
1. Exhaust Hood
- Installed above cooking equipment.
- Captures smoke and grease-laden air.
- Types:
- Type I Hood – For grease-producing equipment (grills, fryers, ranges).
- Type II Hood – For heat and steam only (dishwashers, ovens).
2. Grease Filters / Baffles
- Capture grease particles before they enter the duct.
- Must be fire-resistant and easily removable for cleaning.
3. Exhaust Ductwork
- Carries contaminated air from the hood to the outside.
- Must be made of smooth, fire-resistant material.
- Usually requires frequent cleaning to prevent grease buildup.
4. Exhaust Fan / Blower
- Removes air from the kitchen and pushes it outdoors.
- Roof-mount or wall-mount designs are common.
5. Make-Up Air System (MUA)
- Supplies fresh air to replace the air removed.
- Prevents negative pressure, which can cause:
- Backdrafting
- Poor hood performance
- HVAC imbalance
6. Fire Suppression System
- Mandatory in commercial kitchens.
- Automatically extinguishes grease fires in hoods and on appliances.
Types of Kitchen Exhaust Fans
| Type | Typical Use | Pros |
|---|---|---|
| Centrifugal Upblast Fan | Commercial kitchens | Efficient, keeps grease away from building |
| Inline Fan | When space is limited | Quiet, hidden |
| Wall-Mount Fan | Small kitchens | Easier installation |
| Range Hood Blower | Residential homes | Built into hood or remote |
Why Kitchen Exhaust Systems Are Important
- Fire safety: Grease buildup can ignite.
- Air quality: Removes smoke and harmful particulates.
- Comfort: Reduces heat and humidity.
- Regulatory compliance: Required by NFPA 96 and local codes for commercial kitchens.
If you want, I can help you with:
- Choosing a system for a home or commercial kitchen
- Designing a layout
- Installation guidelines
- Maintenance schedules
- Troubleshooting an existing system