1. The 30-inch cooktop CFM band
The 30-inch cooktop is the standard residential width and accounts for roughly 60-70% of North American cooktop shipments per the ENERGY STAR appliance shipment statistics. The 30-inch cooktop is available in four variants that map to four CFM bands. For a 30-inch electric cooktop (2 burners + 2 burners, induction or radiant), the CFM requirement is 200-300 CFM at zero static pressure. For a 30-inch gas cooktop with 4 burners at standard residential Btu (40,000-60,000 Btu combined peak), the CFM requirement is 400-600 CFM. For a 30-inch gas cooktop with 4 burners at low Btu (under 40,000 Btu combined), the CFM requirement is 300-400 CFM. For a 30-inch induction cooktop at high element density (5-6 elements total), the CFM requirement is 300-450 CFM. The cooktop Btu is the binding constraint for gas; the cooktop element density and kitchen volume are the binding constraints for electric.
| 30-Inch Cooktop Variant | Total Btu | Required CFM (zero static) | Required CFM (15-foot 6-inch install) | JILU Product Line |
|---|---|---|---|---|
| Electric induction, 4 elements | n/a | 200-300 | 150-250 | Under-cabinet A13 / wall-mount T01 |
| Electric radiant, 4 elements | n/a | 200-300 | 150-250 | Under-cabinet A13 / wall-mount T01 |
| Gas, low Btu (under 40,000) | 30,000-40,000 | 300-400 | 200-300 | Under-cabinet A13 / wall-mount T01 |
| Gas, standard residential | 40,000-60,000 | 400-600 | 300-450 | Wall-mount A29 (400-700 CFM) |
| Gas, high output prosumer | 60,000-80,000 | 600-800 | 450-650 | Wall-mount A29 (600-900 CFM setting) |
The 30-inch gas cooktop standard residential variant is the most common specification in the JILU North American order book. The JILU wall-mounted cooker hood A29 product is rated at 400-700 CFM at zero static pressure, which delivers the 300-450 CFM at the cooktop after typical 15-foot 6-inch duct install losses; for a buyer who wants a quieter hood, the A29 can be derated to the lower speed setting (250-400 CFM at the cooktop) at 3-5 sones. The JILU 30-inch CFM per square foot formula provides the Btu-to-CFM and CFM-per-square-foot conversion for the 30-inch variant specifically.
2. The 36-inch cooktop CFM band
The 36-inch cooktop is the upgrade-from-30-inch residential variant and the entry-level for prosumer kitchen design. The 36-inch cooktop is available in three variants that map to three CFM bands. For a 36-inch electric cooktop (typically 5 elements, induction or radiant), the CFM requirement is 300-450 CFM. For a 36-inch gas cooktop with 5 burners (60,000-80,000 Btu combined peak), the CFM requirement is 600-800 CFM. For a 36-inch gas cooktop with 5 burners at low Btu (under 60,000 Btu combined), the CFM requirement is 450-600 CFM. The 36-inch gas cooktop captures roughly 15-20% of the North American market per the ENERGY STAR shipment statistics, with the share growing as the prosumer kitchen design segment expands.
| 36-Inch Cooktop Variant | Total Btu | Required CFM (zero static) | Required CFM (15-foot 6-inch install) | JILU Product Line |
|---|---|---|---|---|
| Electric induction, 5 elements | n/a | 300-450 | 200-350 | Wall-mount T01 / wall-mount A29 |
| Gas, low Btu (under 60,000) | 50,000-60,000 | 450-600 | 300-500 | Wall-mount A29 (400-700 CFM) |
| Gas, standard residential | 60,000-80,000 | 600-800 | 450-650 | Wall-mount A29 (600-900 CFM) |
| Gas, prosumer (sealed burners) | 70,000-90,000 | 700-900 | 550-750 | Wall-mount A29 high + commercial crossover |
The 36-inch gas cooktop standard residential variant is the second-most-common specification in the JILU North American order book. The JILU wall-mounted range hood line covers the 36-inch segment in the 600-900 CFM band, with the A29 wall-mount variant tunable across the standard, low, and prosumer Btu ranges. The hood-width-vs-cooktop-width match rule (discussed in Section 5 below) requires a 36-inch or larger hood width for a 36-inch cooktop to ensure full capture of the rising thermal plume; a 30-inch hood over a 36-inch cooktop leaves the outer burners under-captured and reduces the capture rate by 15-25%.
Prosumer kitchen design trend. The 36-inch gas cooktop segment is the entry point for the prosumer kitchen design trend in North America. The prosumer design segment grew from 8% of new residential kitchen builds in 2018 to roughly 18% in 2025 per the National Kitchen & Bath Association industry data, with the 36-inch cooktop width being the typical starting point (jump from the 30-inch standard residential segment). The prosumer kitchen design typically pairs the 36-inch gas cooktop with a 42-inch wall-mount hood (one size wider than the cooktop for the 6-inch-wider rule), a stone or tile backsplash, and an undermount or apron-front sink. The hood specification for the prosumer kitchen typically exceeds the IRC M1505 makeup air threshold (400 CFM) and requires the makeup air upgrade; the JILU North American kitchen range hood size standards and codes guide covers the prosumer-grade makeup air specification and the per-jurisdiction code compliance requirements.
3. The 48-inch cooktop CFM band
The 48-inch cooktop is the prosumer and light-commercial segment, with the 48-inch gas cooktop typically having 6 burners at 15,000-20,000 Btu per burner (90,000-120,000 Btu combined peak). The 48-inch variant CFM requirement is 800-1,200 CFM at zero static pressure, which is at the edge of the residential hood capacity and at the lower end of the commercial hood capacity. For a 48-inch gas cooktop with 6 burners at standard prosumer Btu (80,000-100,000 Btu combined), the CFM requirement is 800-1,000 CFM. For a 48-inch gas cooktop with 6 burners at restaurant-grade Btu (over 100,000 Btu combined), the CFM requirement is 1,000-1,200 CFM and the hood specification transitions from residential wall-mount to commercial exhaust hood.
| 48-Inch Cooktop Variant | Total Btu | Required CFM (zero static) | Required CFM (15-foot 8-inch install) | JILU Product Line |
|---|---|---|---|---|
| Gas, prosumer residential | 80,000-100,000 | 800-1,000 | 650-850 | Commercial kitchen exhaust hood |
| Gas, restaurant-grade | 100,000-120,000 | 1,000-1,200 | 850-1,000 | Commercial kitchen exhaust hood (high-CFM setting) |
| Gas, dual-oven range (6 burner + griddle) | 120,000-150,000 | 1,200-1,500 | 1,000-1,300 | Commercial kitchen exhaust hood (max) |
| Induction, 6-7 elements | n/a | 400-600 | 300-500 | Wall-mount A29 max setting |
The 48-inch cooktop is the segment where the JILU commercial kitchen exhaust hood line becomes the primary specification, with the commercial hood rated at 900-1,800 CFM. The 48-inch variant also typically requires the makeup air upgrade per the JILU North American kitchen range hood size standards and codes guide, because the hood CFM (1,000+) exceeds the IRC M1505 makeup air threshold (400 CFM) by a wide margin and the IMC Section 505 commercial exhaust requirement applies for hoods above 1,200 CFM. A residential buyer who specifies a 48-inch prosumer gas cooktop without planning for the commercial-grade CFM requirement and the makeup air upgrade ends up with a kitchen that is uncomfortable to cook in (capture rate too low, smoke alarm triggered during normal cooking) and a building envelope that fails code (depressurization backdraft).
Light-commercial crossover. The 48-inch segment also covers the light-commercial crossover use case: a serious home chef who is also running a catering business out of the residential kitchen, a culinary school training kitchen, or a recipe development kitchen for a food media company. These use cases require the commercial-grade hood CFM but may not require the full commercial grease-rated hood construction. The JILU commercial kitchen exhaust hood line with the commercial-grade CFM rating paired with the residential-grade duct and electrical connection provides the crossover specification. The light-commercial crossover installation typically requires a commercial permit even when installed in a residential building, and the local code official should be consulted at the design stage. The JILU hot products page highlights the light-commercial crossover models with the residential-friendly installation features.
4. The CFM per square foot formula for electric cooktops
For electric cooktops (induction or radiant), the CFM requirement can be calculated directly from the kitchen floor area using the CFM-per-square-foot formula. The formula is CFM = (kitchen floor area in square feet × 1.5) + 100, with the 1.5 multiplier covering typical residential smoke and grease capture and the 100 baseline covering the kitchen air exchange. The formula is independently referenced in the ASHRAE 62.2 residential ventilation standard and the HVI certified ratings procedure. For a 100 square-foot kitchen (typical small residential kitchen), the formula gives CFM = (100 × 1.5) + 100 = 250 CFM. For a 150 square-foot kitchen (typical mid-size residential kitchen), CFM = 325. For a 200 square-foot kitchen (typical open-plan residential kitchen), CFM = 400. For a 300 square-foot kitchen (typical prosumer kitchen with adjacent dining area), CFM = 550.
The formula breaks down at the prosumer end because the prosumer kitchen typically has a high-element-density induction cooktop or a high-Btu gas cooktop that exceeds the formula's assumed baseline. For these kitchens, the CFM-per-square-foot formula gives a floor (e.g., 550 CFM for a 300 sq ft kitchen) and the Btu-to-CFM rule gives the actual ceiling (e.g., 700 CFM for a 36-inch gas prosumer cooktop). The buyer should select the higher of the two numbers. The formula also breaks down at the very-large-residential end (over 400 sq ft) because the kitchen hood is sized to the cooktop, not to the kitchen; a 600 CFM hood on a 400 sq ft kitchen is correct even though the formula suggests 700 CFM. The JILU 30-inch CFM per square foot formula guide walks through the formula with worked examples for 100 / 150 / 200 / 300 square-foot kitchens paired with 30-inch, 36-inch, and 48-inch cooktop variants.
5. The hood-width-vs-cooktop-width match rule
The hood width should be equal to or greater than the cooktop width to ensure full capture of the rising thermal plume. The thermal plume from a gas or electric burner rises at 0.5-1.5 m/s under normal cooking and spreads laterally at 0.2-0.4 m/s. The hood captures the plume within the hood inlet area; if the hood inlet is narrower than the thermal plume footprint, the outer edges of the plume escape capture and rise to the ceiling as visible smoke and grease. The capture rate penalty for a hood narrower than the cooktop is approximately 15-25% per 6 inches of width mismatch: a 30-inch hood over a 36-inch cooktop loses 15-25% capture rate relative to a 36-inch hood over the same 36-inch cooktop.
| Cooktop Width | Recommended Hood Width | Capture Rate Penalty if Hood is 6 inches Narrower | Capture Rate Penalty if Hood is 12 inches Narrower |
|---|---|---|---|
| 30-inch | 30-inch minimum, 36-inch optimal | 15-20% (under-cabinet acceptable for low-Btu) | 30-40% (not recommended) |
| 36-inch | 36-inch minimum, 42-inch optimal | 15-20% (capture acceptable for low-Btu) | 30-40% (capture fails for standard gas) |
| 48-inch | 48-inch minimum, 54-inch optimal | 15-20% (capture marginal for standard gas) | 30-40% (capture fails for prosumer gas) |
The implication of the table is that the buyer should typically select a hood that is 6 inches wider than the cooktop for optimal capture. A 30-inch cooktop gets a 36-inch hood; a 36-inch cooktop gets a 42-inch hood; a 48-inch cooktop gets a 54-inch hood. The JILU wall-mount A29 ships in 30-inch, 36-inch, and 42-inch widths; the JILU commercial exhaust hood ships in 36-inch, 48-inch, and 54-inch widths. The 6-inch wider-than-cooktop rule covers the standard residential and prosumer segment without oversizing the hood into the commercial segment. For kitchens with a kitchen island (no back wall behind the cooktop), the rule shifts to the greater-of-(6-inch-wider, ceiling-clearance-compliant) dimension, because the downdraft risk on island cooktops is greater than on wall-mounted cooktops.
6. Quick-reference side-by-side chart
| Dimension | 30-inch Cooktop | 36-inch Cooktop | 48-inch Cooktop |
|---|---|---|---|
| Standard residential gas CFM | 400-600 | 600-800 | 800-1,000 |
| Standard electric CFM | 200-300 | 300-450 | 400-600 |
| Prosumer gas CFM (highest band) | 600-800 | 700-900 | 1,000-1,200 |
| JILU Product Line match (gas) | A29 wall-mount 400-700 CFM | A29 wall-mount 600-900 CFM | Commercial exhaust hood 900-1,800 CFM |
| JILU Product Line match (electric) | A13 under-cabinet 280-450 CFM | A29 wall-mount 400-700 CFM | A29 wall-mount 600-900 CFM |
| Recommended hood width | 30-36 inch | 36-42 inch | 48-54 inch |
| Duct diameter (residential) | 6-inch or 8-inch | 8-inch | 8-inch or 10-inch |
| Makeup air upgrade required | Optional at 400+ CFM | Yes above 400 CFM | Yes (always for prosumer gas) |
| Typical noise (sones) | 3-7 | 5-9 | 7-12 (commercial settings) |
The side-by-side chart combines all five sections above into a single buyer-action table. The buyer locates the cooktop size column (30 / 36 / 48) and the cooktop type row (gas / electric / prosumer gas) at the cell intersection, identifies the CFM band, and then selects the JILU product line that matches the CFM band. The hood width and duct diameter columns are the installation-side corrections that follow from the CFM band selection. The makeup air row is the code-compliance check. The noise row is the residential-comfort check. The ENERGY STAR certification covers the CFM-per-watt efficiency across all three columns; the HVI certification covers the CFM and sones ratings across all three columns; the Intertek laboratory backs the third-party test data behind both certifications. The chart is sized to be printed and used as a buyer reference at the kitchen design stage, paired with the JILU 30-inch CFM per square foot formula guide for the formula derivation.
About the author
Mr. Zheng | Technical Director
Mr. Zheng has spent more than 30 years working on kitchen ventilation, stainless steel fabrication, and performance-focused exhaust solutions for demanding cooking environments. His practical experience covers airflow design, durability planning, and the details that make outdoor BBQ hoods last in real-world conditions.
Experience: 30+ years in kitchen ventilation, stainless steel fabrication, airflow design, durability planning, and commercial exhaust solutions.
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Editorial basis: ASHRAE 62.2 referenced via ASHRAE Standards. HVI referenced via HVI. ENERGY STAR referenced via ENERGY STAR. Product specifications: jilukitchen.com.
Buyer decision workflow. The buyer workflow for selecting the correct range hood for a given cooktop follows four steps. The first step is the cooktop sizing: measure the cooktop width (24 / 30 / 36 / 48 inches) and identify the cooktop type (electric induction, electric radiant, low-Btu gas, standard residential gas, prosumer gas). The second step is the Btu calculation: sum the peak Btu of all burners for gas cooktops, identify the element density for electric cooktops. The third step is the CFM requirement calculation: apply the 1-CFM-per-100-Btu rule for gas (or the CFM-per-square-foot formula for electric) and add 20-30% margin for duct losses. The fourth step is the JILU product line selection: locate the CFM band in the side-by-side chart above and select the JILU model that matches. The buyer who follows the four-step workflow ends up with a correctly-sized hood; the buyer who guesses the hood size from the cooktop width alone ends up with either an undersized hood (combustion safety risk for gas) or an oversized hood (unnecessary cost and noise for electric). The JILU wall-mounted range hood line and the JILU commercial kitchen exhaust hood line cover the full CFM band from the 30-inch standard residential gas cooktop (400-600 CFM) through the 48-inch prosumer gas cooktop (800-1,200 CFM).