For a new event venue, the appliance schedule—not the room name or guest capacity—determines the kitchen ventilation system. Fryers, ranges, griddles, broilers, charbroilers and similar grease-producing appliances normally require a Type I hood, grease-rated exhaust duct, automatic fire suppression and tested makeup air. Equipment that produces only heat or moisture may use Type II or general exhaust, but its heat and humidity still belong in the HVAC load calculation.
Design the system under the locally adopted mechanical, building and fire codes, NFPA 96 and the authority having jurisdiction (AHJ). Confirm the adopted code editions and local amendments before equipment is specified or construction is priced.
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Start with the appliance and emissions schedule
The first design document should list every cooking and holding appliance, its fuel, duty, location, emissions and operating schedule. The hood designer uses this schedule to determine whether the equipment creates grease-laden vapor, ordinary heat, moisture, smoke, odor or a combination of these loads.
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Equipment that normally requires Type I exhaust
Plan on a Type I hood and grease exhaust for fryers, ranges, griddles, broilers, charbroilers and comparable appliances that produce grease-laden vapors. The final classification must still be accepted by the AHJ and supported by the engineered design. A Type I system is not optional merely because the kitchen serves occasional events; a single high-grease appliance can establish the requirement.
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Equipment that may use Type II or general exhaust
Microwaves, toasters, steam tables, popcorn poppers, hot-dog cookers, coffee makers, rice cookers, egg cookers, holding or warming ovens and heat lamps are not typically hooded under the ASHRAE guidance cited for commercial kitchens. They can nevertheless add substantial sensible heat or moisture. If they are unhooded, include their loads in the HVAC calculation and provide ventilation that does not disturb nearby hood capture.
Mixed appliance lines
Event venues often combine a banquet line, a cook-to-order station and temporary or seasonal equipment. Treat the complete operating lineup as one coordinated system. Identify which appliances can run simultaneously, whether mobile equipment will be added later and whether solid-fuel cooking is planned. Do not size the hood around a reduced opening-day menu if the lease, caterer or venue program allows heavier equipment later.
Codes and approvals that control the design
NFPA identifies the 2024 edition of NFPA 96 as the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations. Its scope covers administration, cooking operations, hoods, grease-removal devices, exhaust ducts and air movement. The International Mechanical Code (IMC), International Building Code (IBC), International Fire Code (IFC), adopted electrical rules and local amendments can add requirements.
ASHRAE states that commercial kitchen hood design, engineering, construction, installation and maintenance are governed by nationally recognized standards such as NFPA 96 and model codes such as the IMC, while local codes may prevail. In practice, the AHJ’s adopted editions and written interpretations control the project.
Confirm these items before final design
- Venue address and jurisdiction.
- Occupancy and use classification for the event space and kitchen.
- Adopted IMC, IBC, IFC and NFPA editions, including amendments.
- Fire-department submittal and inspection procedures.
- Environmental, odor and nuisance requirements.
- Roof-discharge, property-line and neighboring-occupancy constraints.
- Historic-district, zoning or façade restrictions that affect duct shafts or roof equipment.
A New York City example requires Type I grease ducts passing through concealed spaces to be enclosed to the outlet and requires plans to show air balance for the kitchen and communicating spaces. That is a local amendment example, not a universal rule. Obtain the requirement for the actual venue before relying on a similar detail.
Type I, Type II and hoodless decisions
| Equipment or emission | Typical treatment | Design consequence |
|---|---|---|
| Grease-laden vapor from fryers, ranges, griddles, broilers or charbroilers | Type I hood with grease exhaust | Grease-rated duct, listed fire suppression, interlocks and capture testing |
| Heat or moisture without grease, such as steam tables or warming equipment | Type II or general exhaust may be appropriate | Include heat and moisture in HVAC calculations; confirm local approval |
| Small heat-producing appliances such as toasters, coffee makers or microwaves | Often unhooded | Provide room ventilation and account for sensible heat and moisture |
| Solid-fuel equipment | Special heavy-duty Type I review | Evaluate creosote, cleaning, clearances, fuel storage and additional fire provisions |
“Type II” is not a shortcut for a grease-producing appliance. If the emissions classification changes, the duct, fan, suppression, clearances and permit package can all change with it.
Exhaust hood selection and capture
The hood must capture the cooking plume under real operating conditions, not just on an empty test kitchen. Select hood dimensions, overhang, filters or extractors, exhaust airflow and fan capacity as one system. Account for appliance duty, cross-drafts, doors, transfer air, supply diffusers and the event room’s changing occupancy.
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Capture-zone coordination
- Keep supply diffusers and makeup-air outlets out of the hood capture zone unless the listed hood design specifically uses them.
- Coordinate pass-through openings, doors and adjacent-room pressure so air does not sweep grease or steam out of the hood.
- Check gas-appliance draft whenever the building is operating under negative pressure.
- Reserve access for filter removal, duct inspection, fan service and suppression maintenance.
A smaller hood can have a lower first cost but become more expensive if it fails capture testing, requires higher exhaust flow, creates comfort problems or forces demolition and redesign.
Grease duct construction and discharge
Grease exhaust ducts carry grease, smoke, volatile organic compounds and odors outdoors. They must be grease-tight, protected from combustibles or enclosed in an approved rated system, and sized for the airflow required to remove the effluent.
Required duct features
- Use a continuous grease-tight construction or a listed factory-built grease-duct system.
- Install listed insulation or enclosure exactly according to its listing and manufacturer instructions.
- Keep the route free of dips, traps and pockets that retain grease.
- Pitch horizontal sections back toward the hood or an approved grease reservoir for drainage.
- Maintain required clearances from combustibles or provide the rated enclosure accepted by the AHJ.
- Provide access for inspection and cleaning where required.
The cited ASHRAE guidance summarizes model-code and NFPA 96 requirements as a minimum exhaust-duct velocity of 500 feet per minute. That minimum does not replace pressure-drop calculations. The designer must also select a fan for the complete system resistance, evaluate noise, allow for thermal expansion on long runs and coordinate the fire-rated shaft or enclosure.
Roof and wall discharge
Locate the discharge so grease, smoke and odor are not drawn back into makeup-air intakes, occupied windows or neighboring properties. Check roof equipment, parapets, property lines and prevailing wind conditions. The final discharge arrangement must satisfy the adopted code and any local environmental or nuisance rules.
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Makeup air, pressure and occupant comfort
Every cubic foot of kitchen exhaust leaves the building. Replacement air must come from an uncontaminated source and be distributed without disrupting capture. Correct makeup-air design supports hood performance, building pressure, gas-appliance draft, odor control and comfort in the event space.
IMC operating requirement
The cited IMC text requires makeup air while commercial kitchen exhaust operates. Total replacement air from all building sources should approximately equal total building exhaust, and mechanical makeup-air systems must start and operate with the exhaust system. Plans must show exhaust, replacement air and net exfiltration in an outdoor-air balance.
The same 2021-code text cited on a Rhode Island amended IMC page limits the temperature difference between makeup air and the conditioned space to 10°F (6°C), unless the design demonstrates sufficient HVAC capacity for the additional load. This is a code provision from that adopted text; verify the edition and amendment in the venue’s jurisdiction.
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Pressure limits and distribution
Do not dump supply air directly into the hood capture zone. Coordinate diffuser locations, transfer grilles, door forces and adjacent-room pressure. ASHRAE’s cited discussion identifies 0.02 inch water column as the NFPA 96 negative-pressure limit addressed there. The engineer should verify the locally adopted language and measure the finished building rather than relying only on a design assumption.
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Fire suppression, fuel shutoff and controls
ASHRAE states that an exhaust system serving equipment that may produce grease-laden vapors must include a fire-suppression system as required by NFPA 96 and the IMC. The automatic system must be listed to UL 300, and IBC and IFC provisions also apply.
Coverage and interlocks
Coordinate the suppression contractor, mechanical engineer, electrical contractor, kitchen-equipment supplier and AHJ. The suppression design should protect the cooking appliances, hood interior, filters or grease extractors, ducts and other grease-removal devices within its listed coverage.
Document the sequence for fuel and electrical shutoff, exhaust-fan operation, makeup-air shutdown or reset, alarm signaling and manual pull stations. The exact sequence depends on the listed equipment and adopted code. A control that leaves a protected appliance energized, or that prevents the required exhaust response, can fail inspection even if the hood itself is correctly sized.
Solid-fuel cooking needs additional review because creosote and heavy grease deposits increase fire and cleaning hazards. Evaluate the appliance listing, duct cleaning frequency, clearances, fuel storage and any special suppression provisions before approving the menu.
Permit drawings and submittal package
Submit coordinated architectural, mechanical, electrical and fire-protection drawings rather than separate, conflicting sketches. Include the following information:
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- Complete appliance and emissions schedule with fuel, duty and simultaneous operating assumptions.
- Hood plan, sections and elevations showing dimensions, filters, access and clearances.
- Calculated exhaust airflow, fan selection, static pressure and roof or wall discharge.
- Grease-duct route, joints, cleanouts, pitch, clearances and rated enclosure or listed-system details.
- Makeup-air source, airflow, temperature, diffuser locations and outdoor-air balance.
- Controls, interlocks, emergency stops, reset locations and equipment schedules.
- Suppression coverage, nozzle layout, agent system listing, manual pulls and service access.
- Structural support, roof curb, weatherproofing and penetrations.
- Maintenance access and cleaning provisions.
Ask the AHJ to identify missing documents before equipment is ordered. A late interpretation about a shaft, discharge location or suppression listing can affect structural work and the event-room ceiling.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Commissioning and the capture-and-containment test
Approval depends on the installed system, not just the approved drawings. The cited IMC text requires capture-and-containment verification with all appliances under the hood at operating temperatures, all makeup-air sources operating and recirculated air serving the space operating. The permit holder must provide the test equipment and devices.
Commissioning sequence
- Verify that the hood, filters, duct, fan, makeup-air unit and controls match the approved submittal and listed installation.
- Start all required exhaust and makeup-air systems through their normal controls.
- Operate every appliance under the hood at its specified operating temperature and duty.
- Operate recirculated air systems serving the kitchen or communicating spaces.
- Measure exhaust airflow, makeup airflow, room pressure and relevant temperature conditions.
- Observe smoke or steam capture at the hood perimeter, corners, pass-throughs and adjacent doors.
- Test suppression alarm, fuel and electrical shutoff, fan response, makeup-air response, manual pulls and reset logic.
- Record noise, drafts, door forces and any visible grease or vapor escape.
- Correct deficiencies, rebalance the system and repeat the test before requesting final approval.
Keep the balancing report, capture-and-containment results, equipment listings, inspection tags, control sequence and maintenance plan in the venue’s operating records. Train managers on filter cleaning, grease-duct service, suppression inspection and the conditions that require the hood to remain in service.
How to compare two ventilation designs
When reviewing alternate layouts or bids, compare the complete operating system rather than hood purchase price.
| Comparison point | Questions to ask |
|---|---|
| Capture performance | Will the hood contain the plume with every listed appliance and makeup-air source operating? |
| Airflow and pressure | What are total exhaust, replacement air and net building pressure under event conditions? |
| Energy | What heating and cooling load is created by outdoor makeup air? |
| Duct and enclosure | Is the route practical, cleanable, serviceable and compliant with fire-rated clearance requirements? |
| Discharge | Could grease or odor re-enter the building or affect neighbors? |
| Suppression | Are all appliances, filters, ducts and extractors within the listed coverage? |
| Operations | Can staff access filters, fans, cleanouts, controls and service panels without disrupting events? |
| Lifecycle | What are the implications for noise, maintenance, cleaning, energy and future menu changes? |
Request airflow and pressure assumptions in writing. A design with lower nominal exhaust can be inferior if it produces cross-drafts, fails the required test or leaves no capacity for the venue’s actual operating lineup.
Common failure modes and corrections
Grease equipment was classified as heat-only
Symptom: A fryer or charbroiler appears under a Type II or general-exhaust plan.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCorrection: Reissue the appliance schedule, classify the emissions correctly, and coordinate Type I hood, grease duct, suppression and interlocks before construction proceeds.
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Makeup air blows through the hood
Symptom: Smoke escapes at the front edge or one corner during testing.
Correction: Rebalance the makeup-air system, relocate or redirect diffusers, check transfer-air paths and retest with all appliances hot.
The building is too negative
Symptom: Doors are difficult to open, gas flames draft poorly or odors move into the event room.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsCorrection: Measure total exhaust and replacement air, check other building exhaust systems, verify fan operation and restore the outdoor-air balance.
Grease collects in the duct
Symptom: Inspection finds a low point, trap or inaccessible horizontal pocket.
Correction: Rework the route or provide an approved drainage and access arrangement. Do not conceal a grease reservoir that cannot be inspected or cleaned.
Suppression controls do not match the equipment
Symptom: A nozzle misses an appliance, fuel remains on after activation or the makeup-air sequence is unclear.
Correction: Have the licensed suppression contractor revise the listed design and control sequence, then obtain AHJ acceptance and repeat functional testing.
Quick Recap
Recommended project sequence
- Freeze the preliminary menu, appliance list and simultaneous-use assumptions.
- Identify the AHJ, adopted code editions and local amendments for the venue address.
- Develop the appliance/emissions schedule and select Type I, Type II or hoodless treatment for each item.
- Lay out the hood, grease duct, fan, discharge, makeup air and rated enclosure together.
- Coordinate suppression, electrical shutoff, controls, roof structure and service access.
- Submit the complete coordinated permit package before ordering long-lead equipment.
- Install listed equipment exactly as approved, including clearances, enclosure and duct pitch.
- Balance and commission the operating system with all appliances hot and all relevant air systems running.
- Resolve deficiencies and retain the final reports, listings, inspection tags and maintenance procedures.
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