Before installing a commercial kitchen hood in Whatcom County, WA, restaurant owners should confirm which hood type their cooking equipment requires, plan makeup air and grease ductwork, coordinate the fire suppression system, and secure health department plan approval and mechanical permits. Settling these details early keeps inspections and opening dates on track.
A hood system is more than a stainless canopy over the line. It ties together ventilation, fire protection, the building’s structure, and several layers of review. This guide covers the decisions that shape a successful commercial kitchen hood installation in Whatcom County, from choosing the right hood to getting through final inspection.
Key Takeaways
- A Type I hood is required over cooking appliances that produce grease or smoke, while Type II hoods handle heat and moisture.
- Makeup air replaces the air a kitchen hood exhausts, and a hood without enough makeup air will not capture smoke properly.
- A Type I hood must be paired with a fire suppression system, which usually needs its own permit and inspection.
- Whatcom County Health and Community Services requires plan approval before construction begins on a new or remodeled food establishment.
- Planning the grease duct route early prevents conflicts with framing, roofing, and clearance to combustible materials.
Type I vs. Type II Hoods for Commercial Kitchens
The hood type depends on what the cooking equipment underneath produces. A Type I hood is required over any appliance that produces grease or smoke, while a Type II hood serves dishwashers and light duty appliances that produce heat or moisture without grease.
This comparison shows how the two hood types differ:
| Factor | Type I Hood | Type II Hood |
| Typical equipment | Fryers, griddles, charbroilers, ranges, and woks | Dishwashers and light duty appliances that produce no grease or smoke |
| What it removes | Grease laden vapor and smoke | Heat, steam, and moisture |
| Grease filters and grease duct | Required | Not designed for grease |
| Fire suppression system | Required over protected cooking equipment | Not typically paired with suppression |
Washington adopts the International Mechanical Code statewide through chapter 51-52 WAC, and that code contains the commercial kitchen hood requirements building departments review. The practical takeaway is simple: finalize the cooking equipment list before the hood is designed. Moving a fryer or adding a charbroiler later can change the hood type, size, and suppression layout.
Why Makeup Air Matters as Much as the Hood
Makeup air is fresh outdoor air brought into the kitchen to replace the air the exhaust hood pulls out. Without enough of it, a hood cannot capture smoke and vapor properly, no matter how well the hood itself is built.
A kitchen that is short on makeup air usually shows it in these ways:
- Doors that are hard to open: Negative pressure pulls against entry and back doors.
- Smoke rolling out from under the hood: The exhaust fan cannot draw air efficiently when the room is starved for supply air.
- Uncomfortable drafts or cold spots: Untempered outdoor air dumped near the cook line makes the space hard to work in during Whatcom County winters.
- Pilot lights and gas appliances that behave poorly: Negative pressure can disturb combustion on nearby equipment.
Our kitchen hood systems can include makeup air fans and a perforated supply plenum, a supply panel that delivers replacement air gently near the hood so it does not disrupt smoke capture. Because makeup air also affects heating and cooling loads for the whole building, our commercial HVAC services team looks at the hood and the rest of the building’s systems together instead of treating them as separate projects.
Planning the Grease Duct and Exhaust Route
A grease duct is the sealed exhaust duct that carries grease laden air from a Type I hood to the exhaust fan, usually on the roof. Its route affects framing, roofing, fire protection, and the cleaning access the kitchen will need for years.
Plans for a Type I hood system typically need to show these details:
- Grease filter location: Filters must sit where they capture grease before it enters the duct.
- Cleanouts: Access points allow the duct to be cleaned along its full length.
- Clearance to combustibles: The duct must keep required distances from wood framing and other combustible materials.
- Duct enclosure and construction: Where the duct passes through floors, walls, or ceilings, the enclosure must be detailed on the drawings.
- Exhaust fan placement: The fan location affects roof penetrations and where exhaust discharges relative to air intakes.
The NFPA 96 standard from the National Fire Protection Association sets requirements for the design, installation, and inspection of commercial cooking ventilation and exhaust systems, and it is the reference fire officials and inspectors rely on. Because every building is different, a hood and duct system often needs parts made to fit. Our in-house commercial metal fabrication department handles restaurant kitchen hood work from design to fabrication to installation, which helps when a space has tight ceilings or an awkward roof path.
Coordinating the Fire Suppression System
A Type I hood must be paired with a fire suppression system that protects the cooking equipment underneath. The suppression system is designed around the appliance layout, so it has to be planned alongside the hood rather than added at the end.
Fire suppression systems for commercial cooking are commonly required to meet the UL 300 standard under the International Fire Code, and they usually require a separate permit and inspection from the hood itself. The hood installer, suppression contractor, and gas or electrical trades all need the same final equipment layout. When those schedules line up, the suppression test and the mechanical inspection can happen without repeat visits.
Permits and Inspections in Whatcom County
A commercial kitchen hood project in Whatcom County usually involves both health department plan review and building department permits. Each agency reviews a different part of the project, and approval from one does not replace the other.
Whatcom County Health and Community Services reviews plans for new and remodeled food establishments, and its plan review packet states that construction should not proceed until plan approval has been granted. The same packet notes that cooking equipment needs proper ventilation and directs owners to their local building services department for those requirements.
Mechanical, electrical, plumbing, and structural permits come from the city or county building department, depending on where the property sits. A kitchen in unincorporated Whatcom County goes through Whatcom County Building Services, while a restaurant inside city limits works with that city’s building department. In our commercial work across Whatcom County, the projects that move smoothly are the ones where permit drawings are prepared before equipment is ordered. Our kitchen hood services include help with the permit process and inspections.
Questions to Settle Before Installation Day
The best time to resolve hood decisions is before fabrication starts, because changes after that point cost time. Use these questions as a final readiness check:
- Final equipment list: Every appliance under the hood affects hood length, type, and suppression nozzle placement.
- Confirmed exhaust path: The grease duct and exhaust fan need a clear, code compliant path out of the building.
- Makeup air plan: Replacement air must be planned with the hood, not after it.
- One shared drawing set: Hood, suppression, electrical, gas, and HVAC contractors should all work from the same current plans.
- Inspection time on the calendar: Health, mechanical, and fire inspections each need time on the calendar before opening day.
Frequently Asked Questions About Commercial Kitchen Hoods in Whatcom County
Can I reuse the hood a previous tenant left behind?
Sometimes, but only if the existing hood matches your cooking equipment and still meets current requirements. Many restaurant spaces in Whatcom County change hands with equipment in place, so have the hood, duct, fan, and suppression system evaluated before you plan your menu around them.
Does LSM handle hood projects from design through installation?
Yes, LSM’s metal fabrication department handles restaurant kitchen hood projects from design to fabrication to installation, with or without fire suppression systems. The team serves restaurants, hotels, and other commercial kitchens across Whatcom, Skagit, and Snohomish counties.
Is financing available for a commercial kitchen hood system?
Yes, LSM’s financing options include a commercial financing program through Optimus Financing. Restaurant owners in Bellingham, Lynden, and across Whatcom County can contact the team to see which options fit their project.
Do residential gourmet kitchens need the same kind of hood?
No, a home kitchen is not held to the commercial cooking requirements that apply to restaurants. Whatcom County homeowners building a gourmet kitchen still benefit from a properly sized hood, and LSM also designs and installs residential gourmet kitchen hoods.
What happens if my menu changes after the hood is installed?
A menu change that adds grease or smoke producing equipment can require changes to the hood, duct, or fire suppression system. Have the change reviewed before the new equipment goes in, especially in kitchens that adjust menus between the busy summer season and the slower winter months.
Planning a Kitchen Hood Project in Whatcom County
A commercial kitchen hood in Whatcom County works best when the hood type, makeup air, grease duct, fire suppression, and permits are planned together before fabrication begins. LSM Heating, Plumbing, & Electric brings metal fabrication, commercial HVAC, and installation under one roof, so restaurant owners get straight answers and one team that stands behind the work. If you are planning a new kitchen or remodeling an existing one, speak with our commercial team to talk through your hood project.
