TL;DR
- Commercial kitchens require split-type range hoods in one of three configurations — wall-mount, island, or insert — and each configuration imposes different CFM requirements, duct diameter specifications, and make-up air considerations that the kitchen designer must calculate before ordering.
- The CFM rating of a commercial range hood is determined by the cooking appliance's BTU output — a 6-burner gas range producing 90,000 BTU/hour requires approximately 900 CFM (100 CFM per 10,000 BTU), and an under-specified hood will capture only 60-70% of cooking effluent.
- Jilu Kitchen's split-type range hoods carry UL 507 and ETL certification for North America, CE marking for Europe, and CB certification for international markets — the motor has been tested for 10,000+ hours of continuous operation.
- OEM customization covers motor configuration, control interface, filter type, housing material, and duct diameter — every order includes a pre-production sample for buyer approval before the production batch is released.
Configuration 1 — Wall-Mount Range Hoods for Perimeter Kitchen Layouts
The wall-mount range hood is the most common commercial kitchen configuration because the cooking line in most restaurant kitchens is positioned against a perimeter wall, with the hood mounted on the wall above the range and the exhaust duct running through the wall to an exterior fan or through the ceiling to a roof-mounted blower. The wall-mount configuration is the simplest to install, the easiest to maintain (the filters, fan, and duct are all accessible from the front of the hood), and the most cost-effective because the wall provides structural support for the hood, eliminating the need for ceiling suspension brackets or island support columns.
The critical specification for a wall-mount commercial hood is the capture area — the hood's width and depth must be at least equal to the cooking surface dimensions, and ideally the hood should extend 3-6 inches beyond the cooking surface on all sides to capture the thermal plume that spreads outward as the cooking vapors rise. A 36-inch-wide commercial range requires a hood with a capture width of at least 42 inches, and the hood should be mounted 28-36 inches above the cooking surface for gas appliances or 24-30 inches for electric appliances. Jilu's wall-mount hoods are available in widths from 30 to 60 inches in 6-inch increments, with standard mounting heights of 28-36 inches adjustable at installation. For restaurant applications where the cooking line has multiple appliances, Jilu offers linked hood sections that can be joined in the field to create a continuous 10-foot or 12-foot hood run, with separate exhaust ducts for each section to balance the airflow across the entire cooking line. Browse our Jilu Kitchen range hood product page for full specifications and dimensional drawings.
Configuration 2 — Island Range Hoods for Open-Kitchen and Show-Kitchen Designs
The island range hood is specified for kitchens where the cooking station is positioned in the center of the room — a design that has become increasingly popular in hotel breakfast buffets, open-kitchen restaurant concepts, and high-end residential projects where the kitchen is a visual centerpiece. The island configuration presents an engineering challenge: the hood must be suspended from the ceiling with no wall to support it, the exhaust duct must run vertically through the ceiling, and the hood must capture cooking effluent from all four sides of the cooking station because there is no wall to contain the thermal plume on one side.
The CFM requirement for an island hood is typically 20-30% higher than for a wall-mount hood serving the same cooking appliances, because the thermal plume spreads 360 degrees from the cooking surface and the hood must generate sufficient capture velocity across a larger perimeter. For a 6-burner gas range producing 90,000 BTU/hour on an island station, the hood's CFM specification should be calculated at 100 CFM per 10,000 BTU with a 25% island factor: 900 CFM x 1.25 = 1,125 CFM. Jilu's dual-motor island hoods are rated up to 1,200 CFM at the maximum speed setting. The duct diameter for a 1,200 CFM exhaust system should be 10 inches (round duct) or equivalent, and the duct run should be as straight and short as possible — each 90-degree elbow in the duct reduces the effective CFM by approximately 10-15%. The hood should be mounted 30-36 inches above the cooking surface for island installations, slightly higher than the wall-mount specification to provide headroom clearance for cooks working around all four sides of the station.
Configuration 3 — Insert Range Hoods for Custom Cabinetry and Built-In Designs
The insert range hood — also called a liner or a power pack — is a hood without an outer shell, designed to be installed inside custom cabinetry, a decorative wood hood, or a stainless steel canopy that is fabricated separately by the kitchen designer. The insert contains the motor, the fan, the filters, and the control panel, and it is mounted inside the surrounding cabinetry with only the filter surface and the control panel visible from below. The insert configuration is common in luxury hotel suites with kitchenettes, high-end residential projects where the hood must match the cabinetry design, and restaurant front-of-house stations where the hood must blend into the architectural design.
The insert specification is more complex than the wall-mount or island specification because the insert must fit within a defined cabinet opening, and the cabinet opening dimensions are determined by the kitchen designer, not by the hood manufacturer. Jilu manufactures insert hoods in custom dimensions based on the buyer's cabinet opening specification, with standard motor configurations available in 600, 900, and 1,200 CFM ratings. The insert's motor housing is designed to fit within a minimum cabinet depth of 12 inches, and the remote blower option allows the motor to be mounted in the attic, on the roof, or in an inline duct housing, reducing the insert's height to approximately 6 inches. My name is Mr. Zheng, and I have spent more than 30 years working on kitchen ventilation, stainless steel fabrication, and performance-focused exhaust solutions for demanding cooking environments. Over those three decades, I have designed airflow systems for restaurants that serve 500 covers a night, hotel kitchens that operate 18 hours a day, and outdoor BBQ stations where wind and weather add complexity. The Jilu insert range hood range includes models from 600 to 1,200 CFM with remote blower and inline fan options for custom cabinetry installations.
Make-Up Air — The Ventilation Requirement That Most Restaurant Owners Discover Too Late
A commercial range hood that exhausts 1,000 CFM of air from the kitchen removes 1,000 cubic feet of conditioned air from the building every minute. In a restaurant with a 15-foot ceiling, that 1,000 CFM exhaust rate will replace the entire kitchen's air volume — approximately 7,500 cubic feet for a 500-square-foot kitchen — every 7.5 minutes. The air that is exhausted must be replaced, or the kitchen will operate under negative pressure, causing backdrafting of combustion gases from gas appliances (a carbon monoxide hazard), difficulty opening exterior doors, and infiltration of unconditioned outdoor air through every gap and crack in the building envelope. This replacement air is called make-up air, and it is a code requirement under the International Mechanical Code (IMC) for any commercial kitchen exhaust system exceeding 400 CFM.
The make-up air system delivers outdoor air into the kitchen at a rate approximately equal to the exhaust rate. The make-up air must be conditioned — heated in winter, cooled in summer — because delivering 1,000 CFM of unconditioned outdoor air into a kitchen in Phoenix in July or Chicago in January would make the kitchen uninhabitable. The make-up air system cost typically equals or exceeds the range hood cost, and it must be designed and installed by a mechanical contractor. Jilu's technical documentation includes make-up air sizing guidelines for each hood model, and I have seen the cost of installing a $3,000 hood with a $12,000 make-up air system catch more than one restaurant owner by surprise. The ASHRAE Standard 154 provides the ventilation design criteria for commercial cooking operations that inform our hood design and airflow calculations.
Outdoor BBQ and Commercial Grill Hoods — The Specialty Configuration Most Manufacturers Cannot Build
Outdoor BBQ range hoods — specified for restaurant outdoor kitchens, hotel poolside grill stations, and residential outdoor cooking areas — face environmental conditions that an indoor kitchen hood never encounters: direct sunlight (UV degradation of plastic components and control panels), rain and humidity (corrosion of the motor housing and electrical connections), wind (disruption of the thermal plume capture and backdrafting of exhaust into the cooking area), and temperature extremes (-20 to +45 degrees Celsius ambient operating range). An indoor hood installed outdoors will fail within 12-18 months — the motor bearings will seize from moisture ingress, the control panel will delaminate from UV exposure, and the stainless steel housing will develop surface rust at the weld points where the chromium oxide passivation layer was disrupted during welding and not re-passivated after fabrication.
Jilu's outdoor BBQ hoods are designed from the motor housing outward for outdoor operation. The motor is sealed to IP55 (dust-protected and protected against water jets from any direction), the control panel uses UV-stabilized membrane switches or stainless steel push-buttons with silicone sealing boots, the housing is fabricated from 304 stainless steel with post-weld passivation treatment, and the exhaust fan is rated for continuous operation at ambient temperatures from -20 to +50 degrees Celsius. The hood is supplied with a weather cover for the exhaust outlet that prevents rainwater ingress when the hood is not in use, and the electrical connection is made through a weatherproof junction box with a cable gland that maintains the IP55 rating at the power entry point. For coastal installations — hotel poolside grill stations within 500 meters of saltwater — Jilu recommends 316 stainless steel instead of 304 for the housing and fasteners, because the molybdenum in 316 provides resistance to the chloride pitting corrosion that 304 will develop in a salt-spray environment within 2-3 years of installation.
Frequently Asked Questions
What is the difference between stainless steel baffle filters and aluminum mesh filters?
Stainless steel baffle filters are the standard for commercial kitchens because they meet NFPA 96 fire safety requirements: the baffles create a tortuous airflow path that causes grease droplets to impinge on the metal surfaces and drain into a grease collection channel, while the metal baffles act as a flame arrestor that prevents a cooking surface fire from propagating into the exhaust duct. Stainless steel baffle filters are dishwasher-safe, have an indefinite service life, and maintain their airflow resistance over time because they do not clog. Aluminum mesh filters are lighter and less expensive but are not rated for flame arrestance to NFPA 96 standards, they clog with grease over time, and their airflow resistance increases as they clog, reducing the hood's effective CFM. For any commercial kitchen where the hood will operate more than 4 hours per day and will be subject to a fire code inspection, stainless steel baffle filters are the correct specification.
Can Jilu range hoods be operated with a ductless configuration?
Ductless range hoods use charcoal filters to absorb odors and recirculate the filtered air back into the kitchen. This is suitable for residential kitchens and light commercial applications where installing an exterior duct is physically impossible. However, ductless operation has three significant limitations for commercial kitchens: the charcoal filters do not remove heat or moisture from the exhaust air, the charcoal filters must be replaced every 3-6 months, and the ductless configuration does not meet the International Mechanical Code requirements for commercial kitchen exhaust, which mandate exterior discharge for any hood serving solid-fuel or gas cooking appliances. Jilu offers charcoal filter kits for ductless operation on request, but only for residential and light commercial applications.
What is the lead time for a custom OEM commercial range hood from Jilu?
For a standard catalog model, the production lead time is 3-4 weeks from order confirmation. For an OEM customized model — custom dimensions, custom motor configuration, custom control interface, or custom finish — the lead time is 5-7 weeks depending on the extent of the customization. Jilu ships range hoods in steel-reinforced plywood crates, loaded into containers at our factory in Shengzhou, Zhejiang. Ocean freight from Ningbo/Shanghai to major European ports is approximately 25-30 days, and to North American ports approximately 18-25 days.
What certifications do Jilu range hoods carry for different markets?
Jilu Kitchen range hoods carry UL 507 (Electric Fans) and ETL certification for the North American market, CE marking under the Low Voltage Directive and EMC Directive for Europe, and CB certification (IEC 60335-2-31) for markets recognizing the IECEE CB Scheme. For North America, UL or ETL is non-negotiable — building inspectors will check for the certification mark during the final electrical inspection and will not approve the installation without it — Amazon compliance will de-list any range hood SKU without it. For Europe, CE marking is the minimum legal requirement, and the importer is responsible for maintaining the Technical File. Jilu provides the test reports, Declaration of Conformity, and circuit diagrams required.
How do I calculate the correct CFM, and what happens if I undersize the hood?
The correct CFM for a commercial range hood is calculated from the cooking appliance's BTU output: CFM = total appliance BTU / 100, rounded up to the nearest 100 CFM. A cooking line with a 90,000 BTU gas range and a 30,000 BTU griddle requires 1,200 CFM. If the hood is mounted higher than 36 inches above the cooking surface, the CFM should be increased by approximately 10% for every additional 6 inches. An undersized hood will capture approximately 65-70% of cooking effluent at the center but only 40-50% at the edges, sending smoke, grease vapor, and carbon monoxide into the kitchen. The cost of replacing an undersized hood with a correctly sized one is approximately 2-3 times the cost of specifying the correct hood in the first place.