What a ghost kitchen hood system has to handle
A ghost kitchen hood system serves cooking that is optimized for delivery: fried and griddled food that travels well, produced in high volume during short evening and weekend peaks. That usually means fryers, griddles and charbroilers running hard under hoods that are smaller than a full restaurant line but loaded heavier per foot.
The facility is often a group of kitchens rather than one. An operator may lease a light industrial building and build six, ten or more kitchen modules, each rented to a brand or used for several virtual brands at once. Every module needs its own Type I hood, fire suppression and exhaust path, plus shared make-up air for the building.
Because the business model depends on opening fast, the exhaust design has to be repeatable. A module that is engineered once and built many times saves design time, permitting time and fabrication cost.
Fryer-heavy menus and how they drive exhaust
A delivery menu built around fried food puts most of the cooking line in medium or heavy duty, and that sets the exhaust rate for the hood. Under ASHRAE 154 duty classes, fryers sit in the medium range while charbroilers are heavy duty, and a hood serving a mix is usually designed for the heaviest appliance under it.
| Appliance | Common duty class | Ghost kitchen note |
|---|---|---|
| Open deep fat fryer | Medium | Often two to four per module; high grease loading on filters |
| Griddle / flat top | Medium | Smash burgers and breakfast concepts |
| Underfired charbroiler | Heavy | Smoke and grease vapor; pushes inspection frequency up |
| Wok range | Commonly heavy | Fast, hot plume; needs depth and capture |
| Convection or conveyor oven | Light | Pizza and baked items; may still sit under the Type I hood |
Grease volume is the second effect. High fryer counts load baffle filters quickly and coat the duct faster than a typical full-service restaurant. Plan for daily filter cleaning, and expect the inspection contractor to recommend a frequent cleaning interval. Our Type I grease hood page covers filter types and suppression for these lines.
Multiple small kitchens in one building
The layout decision in a multi-kitchen facility is whether each module gets its own duct and fan, or whether modules share risers. Most ghost kitchen operators choose individual systems for each kitchen because tenants change, operating hours differ and a fire or cleaning problem in one kitchen should not shut the others.
Repeatable module design
- One standard hood length and depth, sized for the heaviest expected menu.
- One fire suppression design repeated per module, with nozzle coverage that suits common appliance swaps.
- Standard duct route from hood collar to roof, kept as short and straight as the building allows.
- A matched fan selection so spare parts and belts are common across the building.
- Shared make-up air, distributed to the corridor or directly to each module.
Where a shared exhaust system is proposed, the same questions arise as in a food hall exhaust project: separation between tenants, balancing when modules are empty, and coordinated cleaning. The AHJ will look closely at any common duct serving separately operated kitchens.
Leased industrial buildings and roof capacity
Light industrial and flex buildings are popular for ghost kitchens because rent is lower and delivery access is easy, but their roofs were rarely designed to carry a row of exhaust fans and make-up air units. Before signing a lease, confirm the roof can take the equipment.
| Check | Why it matters |
|---|---|
| Roof structure (joists, deck, load capacity) | Each upblast fan, curb and make-up air unit adds point loads; long-span joists may need reinforcement |
| Roof type and age | Many penetrations in an old membrane invite leaks; landlord may require a specific roofer |
| Clear height inside | Determines whether duct can run horizontally above the hood and still slope back |
| Combustible construction | Wood joists or decks mean grease duct clearance and protection must be planned carefully |
| Gas service size | Many fryers and woks in many modules add up to a large gas load |
| Electrical service | Fans, make-up air units, walk-ins and controls for every module |
Grease duct clearance to combustible construction is commonly referenced at 18 inches, reducible with listed protection, but confirm against the code edition adopted locally. Upblast fans commonly discharge at least 40 inches above the roof and need hinged bases for cleaning. A structural engineer's letter on roof capacity is cheap compared with discovering the problem after fans are delivered. Our commercial kitchen exhaust fan page explains fan placement in more detail.
Rapid build-outs without shortcuts
Speed in a ghost kitchen project comes from preparation, not from skipping steps. The plan review, the hood and suppression inspections, and the fire marshal sign-off happen regardless of how fast the operator wants to open.
What actually shortens the schedule:
- Finalize the equipment list for the first modules before hood design starts.
- Submit a repeatable module design so later kitchens follow an approved pattern.
- Release hood fabrication as soon as drawings are approved, since fabrication is often the longest lead item.
- Coordinate roof penetrations, curbs and structural work before the hoods arrive.
- Have the fire suppression contractor ready for testing once hoods and appliances are set.
The commercial kitchen hood installation page outlines the sequence from rough-in to final inspection.
Odor and noise in mixed-use and industrial areas
Odor complaints are one of the most common problems ghost kitchens face, because a dense row of fryer and charbroiler exhaust fans can sit close to offices, apartments or other tenants in the same park. A single restaurant fan is noticeable; ten of them on one roof can be a nuisance.
- Fan location and discharge. Keep discharge away from air intakes, operable windows and property lines. Higher discharge stacks help dispersion where allowed.
- Odor control equipment. Pollution control units with filtration stages, or odor neutralizing systems, are used where neighbors are close. They add static pressure, filter maintenance and cost.
- Fan noise. Many fans running in the evening can bother residential neighbors. Fan selection, speed and placement matter.
- Grease on the roof. Heavy fryer loads leave grease at the fan. Grease containment at each fan protects the roof membrane and is often required.
Some local codes and lease terms set odor requirements outright. Ask before design, because adding odor control after opening is expensive.
Make-up air for a building full of hoods
Make-up air is where multi-kitchen ghost kitchen facilities most often fall short, because the exhaust from many modules adds up to a volume of air the original warehouse HVAC cannot replace. Without enough supply, doors whistle and slam, hoods spill smoke into the corridor, and gas appliances with draft hoods or flues can behave poorly.
Most facilities use one or more dedicated make-up air units on the roof, sized to replace most of the total exhaust at full build-out, with the balance transferred so each kitchen stays slightly negative to the corridor. Distribution matters as much as volume: supply delivered to a central corridor reaches the far modules slowly, while ducted supply to each kitchen gives steadier capture. Tempering is a cost and comfort decision. Cooks in a sealed module with heavy fryer loads notice quickly when winter air is delivered cold or summer air arrives hot and humid.
If modules will open in phases, size the units and curbs for the final count, or leave space and structural capacity for a second unit. The make-up air system page compares unit types and controls.
Information to send for a ghost kitchen quote
Send the building floor plan, the proposed kitchen module layout and the equipment list per module, plus roof photos or a roof plan if available. Tell us how many kitchens open in phase one and how many later. If a menu is already known for each brand, list it; if not, tell us the heaviest cooking you want the modules to support, since that sets hood size and airflow for every kitchen.
Also note whether the landlord has rules on roof penetrations, approved roofers or fan placement, and whether neighbors are residential. From that we can price a repeatable hood and exhaust package and flag any building issues early. Use request a quote to send files.
Ghost Kitchen Hood Questions
- Does every ghost kitchen module need its own hood?
- Every module with grease or smoke producing appliances needs a Type I hood over those appliances. Modules can share make-up air and sometimes share an exhaust riser, but individual hoods and suppression are standard. Modules that only assemble or package food without cooking may not need a hood, subject to the AHJ.
- Can we use ventless hoods to avoid roof work in a leased building?
- Some recirculating systems are listed for specific electric fryers and ovens, and they can reduce roof penetrations. They are rarely suitable for gas appliances, charbroilers or multi-fryer lines at high volume, and their filters are costly to maintain. Confirm the listing and AHJ acceptance before planning a facility around them.
- How often should a fryer-heavy ghost kitchen clean its exhaust system?
- NFPA 96 sets inspection frequency by cooking volume. A kitchen running fryers for long hours, or charbroiling, may fall into the high-volume category, which is commonly quarterly. A qualified inspector decides based on actual buildup. Filters themselves usually need daily cleaning in these kitchens.
- What should we check on a warehouse roof before leasing for a ghost kitchen?
- Check structural capacity for fans and make-up air units, the condition and type of roofing, combustible construction, and whether the landlord allows multiple penetrations. Also confirm gas and electrical service size. A structural engineer and a roofer can assess most of this before the lease is signed.
- How fast can a ghost kitchen hood system be installed?
- Installation itself is often a short phase. The schedule is usually set by design approval, hood fabrication lead time and inspections. A standard module design, an early equipment list and coordinated roof work are the biggest time savers. Expect the overall timeline to depend heavily on the local plan review process.
- Can different brands rotate through the same ghost kitchen module?
- Yes, that is common, but the hood and suppression system are designed around specific appliances and positions. If a new brand brings a charbroiler or wok into a module designed for fryers and griddles, the hood airflow and suppression nozzle layout may need changes. Have the suppression contractor review any appliance swap before cooking starts.