Selecting the proper commercial exhaust hood is one of the most important decisions you'll make when designing or upgrading your restaurant kitchen. At 24/7 Restaurant Equipment, we understand that an exhaust hood isn't just another piece of equipment—it's a critical safety system that protects your staff, your building, and your business from fire hazards while keeping your kitchen comfortable and compliant with local codes.
Choosing the wrong hood can lead to inadequate smoke and grease capture, costly energy waste, failed health inspections, or worse, a fire safety violation that shuts down your operation. With so many hood styles, sizing calculations, and filtration options available, it's easy to feel overwhelmed. This guide breaks down everything you need to know to make an informed decision, from understanding Type I versus Type II systems to calculating proper CFM requirements and selecting the right filtration for your cooking line.
Key Takeaways
- Type I hoods handle grease-producing equipment like fryers and griddles; Type II hoods manage heat and steam from non-grease equipment.
- All exhaust hoods must comply with NFPA 96 standards and carry UL 710 certification.
- Proper CFM sizing ranges from 100-400+ CFM per linear foot depending on equipment and hood style.
- Demand-controlled ventilation (DCV) can cut energy costs by 30-50% compared to constant-speed systems.
- Baffle filters are now the industry standard, replacing older, higher-risk mesh filters.
- Make-up air systems are essential for maintaining proper kitchen pressure balance.
Understanding Hood Types: Type I vs. Type II
The foundation of choosing the right exhaust hood starts with understanding which category your kitchen needs. Type I hoods are engineered specifically for equipment that produces grease-laden vapors and smoke, including fryers, griddles, charbroilers, and ranges. These hoods incorporate grease filtration and are required to meet strict fire-safety standards because grease buildup in ductwork is a leading cause of commercial kitchen fires.
Type II hoods, by contrast, are designed for equipment that generates heat, steam, or odors without grease—think dishwashers, steamers, and convection ovens. Because they don't handle grease-laden effluent, Type II hoods have less stringent fire suppression requirements, though they still play an important role in maintaining air quality and comfort in the kitchen.
Many restaurants require both hood types depending on their menu and equipment layout. For pizza operations and similar concepts, exhaust-only hood systems like the Pizza Group PWDSHF9 Exhaust Only Hood offer targeted ventilation solutions designed to integrate seamlessly above specialty cooking equipment. Misclassifying your equipment or installing the wrong hood type is one of the most common—and costly—mistakes restaurant owners make during buildouts.
Selecting the Right Hood Style for Your Kitchen Layout
Once you've determined your hood type, the next step is choosing a style that matches your kitchen's physical layout and workflow. Each style serves different spatial and ventilation needs.
Wall-Mounted Canopy Hoods
Installed against a wall above a row of cooking equipment, these are the most common hood style for kitchens with linear equipment layouts. They offer efficient capture with moderate CFM requirements.
Island Canopy Hoods
Suspended from the ceiling over equipment positioned away from walls, island hoods require higher CFM due to open-air exposure on all sides, making proper sizing even more critical.
Backshelf and Low-Proximity Hoods
Compact and mounted closer to equipment, these are ideal for tight kitchens where ceiling clearance or space is limited, offering effective capture without the footprint of a full canopy.
For operations running specialty equipment like deck ovens or specific pizza-prep lines, models such as the Pizza Group PHPHF6L Exhaust Only Hood and the Pizza Group PHPH4 Exhaust Only Hood are built to fit compact layouts while still delivering reliable exhaust performance. Choosing a style that matches both your equipment and kitchen footprint ensures you're not overspending on unnecessary capacity or underperforming on critical ventilation.
Calculating CFM: Getting the Airflow Right
Proper CFM (cubic feet per minute) calculation is arguably the most technical—and most important—part of hood selection. Undersized hoods fail to capture smoke and grease effectively, leading to residue buildup, odor problems, and failed inspections. Oversized hoods waste energy, increase noise levels, and drive up utility costs unnecessarily.
Typical CFM Requirements by Hood Style (Per Linear Foot)
100
Backshelf
175
Wall-Mounted
400
Island Canopy
These figures are general guidelines; actual requirements depend on equipment BTU output, hood overhang length, and duct configuration. Working with a knowledgeable supplier helps ensure your calculations account for your specific equipment lineup, including high-output items like charbroilers or specialty ovens that demand higher capture velocities.
Filtration and Fire Suppression: Non-Negotiable Safety Features
Filtration is the frontline defense against grease fires. Baffle filters have become the industry standard, offering superior grease capture and lower fire risk compared to older mesh filters, which are increasingly restricted under local fire codes. Baffle filters are UL-listed, easier to clean, and far more effective at trapping grease particles before they reach the ductwork.
Every Type I hood must be paired with a UL 300-compliant fire suppression system. These systems include automatic shutoffs for gas and fuel lines when activated, instantly cutting off the fuel source to any fire that develops within the hood or duct system. This integration between hood, filtration, and suppression isn't optional—it's a code requirement enforced by NFPA 96 and local fire marshals.
| Component | Purpose | Code Reference |
|---|---|---|
| Baffle Filters | Grease capture and fire risk reduction | UL 1046 / NFPA 96 |
| Fire Suppression System | Automatic fire detection and extinguishing | UL 300 |
| Fuel Shutoff Valves | Cuts gas supply during suppression activation | NFPA 96 |
Investing in properly certified filtration and suppression components protects not just your equipment, but your entire establishment and the people inside it.
Make-Up Air and Energy Efficiency Considerations
As your exhaust hood removes air from the kitchen, that air must be replaced to maintain proper pressure balance—this is where make-up air systems come in. Without adequate make-up air, you'll experience symptoms like doors that are difficult to open, HVAC systems working overtime, and even backdrafting of combustion appliances. A well-designed make-up air system introduces tempered replacement air that matches the volume being exhausted.
Energy efficiency has become a major focus in modern hood design. Demand-controlled ventilation (DCV) systems use sensors to detect cooking activity and automatically adjust fan speeds accordingly, rather than running at full capacity continuously. This technology can reduce energy costs by 30-50% compared to constant-speed systems, making it an attractive investment for operators looking to lower utility bills without sacrificing performance.
When evaluating exhaust-only hood options for specialty applications, models like the Pizza Group PWDSHF9-DS Exhaust Only Hood and the Pizza Group PWDH9-DS Exhaust Only Hood offer efficient designs suited for operations prioritizing both performance and energy savings. Pairing the right hood with a properly sized make-up air system ensures your kitchen stays comfortable, compliant, and cost-effective to operate.
Final Thoughts on Choosing Your Exhaust Hood
Choosing the right commercial exhaust hood requires balancing fire safety compliance, proper airflow calculations, filtration standards, and energy efficiency. From identifying whether you need a Type I or Type II system to selecting the appropriate style and CFM rating for your kitchen layout, every decision impacts your restaurant's safety and bottom line.
At 24/7 Restaurant Equipment, we're committed to helping restaurant owners and operators find equipment that meets both code requirements and operational needs. Whether you're outfitting a new kitchen or upgrading an aging ventilation system, our team can help you navigate hood styles, sizing, and filtration options with confidence. Browse our exhaust hood selection or reach out to our equipment specialists today to find the right ventilation solution for your restaurant's unique needs.