Ducted vs ductless is not a quality question — it is an airflow path question. A ducted range hood pulls cooking effluent outside the building through a duct run. A ductless (recirculating) range hood filters the air through a metal mesh or baffle filter for grease and a charcoal filter for odor, then returns the cleaned air to the kitchen. Both work. Both have trade-offs. Choosing between them means understanding where the air goes, what the filter does, and which listing mark applies — not which brand has a higher CFM number on the carton.
1. The Airflow Path Is the Only Difference That Matters
Every other difference between ducted and ductless hoods — CFM, noise, filter cost, code compliance — flows from the airflow path. Once you understand where the air goes, the rest of the comparison is engineering detail rather than marketing.
Ducted (UL 710)
Path: Cooktop → Capture area → Baffle filter → Blower → Duct → Wall/roof exit
What leaves: Smoke, grease, moisture, combustion gases, VOCs, ultrafine particles
What stays: Nothing — all cooking effluent is exhausted
Best for: high-heat, commercial, outdoor, gas
Ductless (UL 710B)
Path: Cooktop → Capture area → Baffle/mesh filter → Charcoal filter → Blower → Kitchen air return
What leaves: Grease (baffle/mesh) and odor (charcoal)
What stays: Moisture, combustion gases, ultrafine particles
Best for: apartment, light residential, no exterior wall
The ducted path physically removes moisture and combustion gases. The ductless path does not — moisture returns to the room, which can cause condensation on windows and walls in cold climates, and combustion gases return to the room, which is a concern for gas cooktops where carbon monoxide and nitrogen dioxide are produced.
For OEM buyers, this is the single most important fact: a ductless hood is a filter, not an exhaust. The buyer who treats a ductless hood as a substitute for a ducted hood is going to have a customer service problem when the kitchen steams up or smells of yesterday's cooking.
2. The 6-Dimension Decision Matrix: Ducted vs Ductless Across All Real Trade-offs
The decision between ducted and ductless is rarely one-dimensional. Across hundreds of OEM inquiries JILU has shipped, the buyers who ask the right questions are working through six distinct dimensions. The matrix below maps each dimension to the answer for ducted and ductless, with a third column noting the application case where the trade-off flips.
| Dimension | Ducted (UL 710) | Ductless (UL 710B) | Application Where It Matters |
|---|---|---|---|
| 1. CFM loss over time | 5-10% loss to duct length and bends. Stable across years. | 10-15% loss to clean charcoal filter; 25-35% loss after 6 months of use. | OEM buyers shipping to apartment buildings: ductless is acceptable because CFM at full load is still adequate for the cooking load. |
| 2. Installation complexity | High. Requires wall or roof penetration, duct routing, exterior termination, fire-rated duct material in commercial. | Low. Power supply, mounting, charcoal filter cartridge. No wall work. | High-rise apartments with no exterior wall access; ductless is the only option. |
| 3. Code compliance | Mandatory for commercial kitchens per NFPA 96. Required for residential gas cooktops in most jurisdictions. | Permitted in residential installations only. Not allowed for commercial. | Commercial buyers must choose ducted — there is no code-compliant ductless commercial hood. |
| 4. Energy efficiency | Lower — exhausts heated or cooled indoor air outside, which the HVAC must replace. | Higher — returns filtered air to the room, no HVAC penalty. | Cold-climate residential buyers with high heating costs: ductless saves 5-10% of HVAC energy. |
| 5. Maintenance cost | Baffle filter cleaning every 1-3 months. No replacement cartridges. | Charcoal filter replacement every 6-12 months ($15-40 per cartridge). | OEM buyers can bundle a 2-year charcoal filter pack into the shipment to reduce service contacts. |
| 6. Cleaning effectiveness | High — removes grease, smoke, moisture, combustion gases, VOCs. | Moderate — removes grease and odor; does not remove moisture or gases. | High-heat cooking (wok, searing, gas): ducted only. |
For OEM buyers shipping to the North American market, the matrix collapses to two questions: (1) Is the installation residential or commercial? (2) Is there an exterior wall or roof available for duct routing? Commercial means ducted, no exceptions. Residential with exterior access means ducted is preferred. Residential without exterior access means ductless is the only practical option.
3. Why CFM Numbers Are Not Comparable Between Ducted and Ductless
The single most common mistake JILU sees from OEM buyers is comparing the CFM number on a ducted hood carton to the CFM number on a ductless hood carton as if they were the same measurement. They are not.
HVI rates hoods at 0.1 inches of static pressure. A ducted hood rated at 400 CFM delivers 400 CFM at 0.1 in static pressure, which simulates a properly installed duct run with one or two bends. A ductless hood rated at 400 CFM delivers 400 CFM at zero static pressure, which is the no-filter theoretical maximum. As soon as you add the charcoal filter, the static pressure jumps to 0.3-0.5 in, and effective CFM drops by 10-15%. After 6 months of use, the loaded filter can drive static pressure to 0.6-0.8 in, and effective CFM drops by 25-35%.
The practical rule: a ductless hood needs to be sized 25-35% larger than a ducted hood for the same effective airflow after 6 months of operation. If a kitchen design calls for 400 CFM of effective airflow, the ducted hood can be a 400 CFM model, but the ductless hood should be a 550-600 CFM model.
4. The 5 Installation Scenarios: Which Path Wins Each
For OEM buyers configuring a range hood line for a multi-region launch, JILU's engineering team maps every inquiry to one of five installation scenarios. The scenario determines the right path (ducted or ductless), and in turn the right SKU, listing mark, and configuration.
| Scenario | Path | Why | JILU Configuration |
|---|---|---|---|
| 1. Single-family home, exterior wall access | Ducted | Best cleaning performance; lowest long-term maintenance | Standard UL 710 catalog SKU, 6"/8" duct transition |
| 2. Apartment / condo, no exterior wall | Ductless or convertible | Exterior work prohibited by building management | UL 710B or convertible SKU with charcoal filter cartridge |
| 3. Commercial kitchen (NFPA 96) | Ducted (mandatory) | Code compliance requires exhaust; ductless is not permitted | UL 710 SKU with Type 1 hood rating, fire-suppression integration |
| 4. Rental property / Airbnb | Ductless | Lowest install cost; landlord can swap units between tenants | UL 710B SKU with bundled 2-year charcoal filter pack |
| 5. Outdoor kitchen (post-2025 alfresco) | Ducted | High BTU + no ceiling containment = ducted mandatory | UL 710 weather-rated SKU with 10" duct transition |
For OEM buyers shipping across multiple regions, the most common SKU mix is 60% ducted / 40% ductless for residential markets, and 100% ducted for commercial markets. JILU's convertible chassis covers both paths from the same SKU, which simplifies inventory for OEM buyers who want one catalog number that works for both installation types.
5. The Charcoal Filter Lifecycle and OEM Cost Implications
For OEM buyers, the charcoal filter is both an advantage and a cost. The advantage: ductless hoods ship to apartment buildings where ducted hoods cannot. The cost: customers must replace the filter every 6-12 months, and a missed replacement degrades performance to the point of complaints.
JILU ships ductless hoods with the first charcoal filter pre-installed. The replacement cartridges are sold separately as a service part. The OEM buyer has three options for handling the cartridge pipeline:
- Bundle at shipment. Include a 2-year cartridge pack (4 cartridges for typical use) in the carton with the hood. This adds $60-160 to the shipment cost but eliminates the most common customer service issue ("my hood smells").
- Subscription service. Set up an annual cartridge subscription for the end customer. JILU's OEM partners who run direct-to-consumer storefronts typically price the subscription at $25-40/year, which is a recurring revenue line for the retailer.
- Drop-ship on request. Leave the replacement cartridges out of the initial shipment and ship on customer request. This is the lowest-cost option but generates the most service contacts.
For OEM buyers shipping through distribution channels (where the end customer is two steps away from the OEM), option 1 (bundle at shipment) is the most common because it removes the service loop entirely. For direct-to-consumer brands, option 2 (subscription) is increasingly the default.
6. How JILU Configures Convertible Hoods for OEM Buyers
Across the last 24 months, JILU's most-shipped range hood SKU for OEM buyers has been the convertible chassis — a single physical hood body that ships with both ducted and ductless certifications on the inner-chassis label, and ships with the charcoal filter cartridge in a separate bag inside the carton. The installer (or end customer) chooses the path at install time:
- Ducted configuration: Leave the charcoal filter cartridge in the bag. Connect the duct to the blower outlet. Vent outside.
- Ductless configuration: Open the bag and install the charcoal filter cartridge between the blower outlet and the recirculating grille. Do not connect a duct. The grille points back into the kitchen.
The conversion takes about 5 minutes with a screwdriver. No rewiring, no blower swap. The same UL file number covers both configurations, and JILU's ETL file covers both UL 710 and UL 710B on the convertible chassis.
The convertible approach is the single most useful SKU design JILU has built for OEM buyers, because it removes the "which path should I ship?" question from the order entry process. The OEM buyer orders one SKU, ships one SKU, and the installer chooses the path at install time. For distribution-heavy markets this halves the SKU complexity.
Configure Your Ducted / Ductless Hood Line
If you are evaluating ducted vs ductless hoods for an OEM line that ships across both apartment and single-family markets, JILU's convertible chassis SKU covers both paths with one catalog number. Send your installation scenarios (1-5 from above), expected SKU mix, and target region, and we will return a configuration matrix with airflow loss curves, charcoal filter cost projection, and the inner-chassis label layout.
Request a Configuration Matrix → View Convertible Hood Product →7. The Procurement Audit: 6 Checks Before Signing the PO
Across hundreds of OEM inquiries for ducted vs ductless hoods, JILU has consolidated the pre-shipment verification into a 6-step audit. The audit is what JILU's quality team runs internally before a hood is boxed, and it is the same checklist we recommend OEM buyers run when receiving an inbound shipment.
- Listing mark on the inner-chassis label — UL 710 for ducted, UL 710B for ductless, or both for convertible. The mark must be ETL or UL, with a file number traceable in the testing body's directory.
- CFM rating path — confirm whether the rated CFM is at 0.1 in static pressure (ducted standard) or zero static pressure (ductless). If the two ratings differ, confirm the OEM buyer's installation path.
- Baffle filter spec — stainless steel baffles, dishwasher-safe. Mesh filters are acceptable but clog faster and require more frequent cleaning.
- Charcoal filter cartridge included if ductless, separate bag if convertible. Confirm the cartridge is present in the carton.
- Duct adapter plate — round or rectangular transition sized to the OEM buyer's duct. Common sizes: 6", 8", 10" round; or 3-1/4" x 10" rectangular.
- Material certificate for 304 stainless steel (most installations require 304, not 430). The inner chassis label carries the steel grade.
For commercial installations that need NFPA 96 compliance on top of UL 710, the audit adds a seventh check: a fire-suppression integration drawing signed off by the suppression system supplier (Ansul, Kidde, or equivalent).
For our related guide on the three physical installation types (wall mount vs island vs under-cabinet), see Wall Mount vs Island vs Under-Cabinet: The 2026 Buyer's Guide — which complements this airflow-path discussion with the spatial layout dimension.
8. Where JILU Fits in the Ducted vs Ductless Range Hood Class
JILU has been building stainless steel kitchen ventilation in Shengzhou, Zhejiang since 1993 — over 30 years on the same product line. The ducted and ductless hoods we ship today share the same chassis design, the same baffle filter system, and the same UL file number where applicable. The OEM buyer chooses the path at install time, not at order time.
The product line for the convertible class includes under-cabinet (the most common convertible SKU), wall-mounted, and island configurations, in 304 stainless steel and black-stainless finishes. Both 110V/120V (residential) and 220V/240V (commercial) configurations are available. The charcoal filter cartridge for ductless operation is a separate service part that can be bundled at shipment or drop-shipped.
For OEM buyers who are still deciding between a ducted-only catalog and a ductless-only catalog, JILU's technical team can walk through the 6-dimension decision matrix with your specific installation scenarios and expected SKU mix. The contact path is below.
Standards & References
- UL Certification Services — UL 710 (ducted hoods) and UL 710B (recirculating hoods) standards
- Intertek ETL Mark — third-party certification for both UL 710 and UL 710B listings
- HVI Home Ventilation Guide — CFM calculation rules for both ducted and ductless installations
- NAKS — UL vs ETL certification for ducted and recirculating range hoods
- NFPA — NFPA 96 commercial cooking ventilation (ducted only)
Frequently Asked Questions
What is the difference between ducted and ductless range hoods?
A ducted range hood vents cooking effluent outside the building through a duct run, removing smoke, grease, moisture, and combustion gases. A ductless (recirculating) range hood filters the air through a combination of metal mesh or baffle filters for grease and a charcoal filter for odor, then returns the cleaned air to the kitchen. Ducted hoods require a wall or roof penetration and a duct run; ductless hoods do not require any venting path but require periodic charcoal filter replacement.
Do ductless range hoods actually work?
Yes, but with two important limits. A ductless hood captures grease through the metal mesh or baffle filter effectively, but it does not remove moisture or combustion gases — those return to the room. The charcoal filter handles odor but does not remove ultrafine particles or VOCs. For light residential cooking (1-2 burners, low heat), ductless hoods are adequate. For high-heat cooking (wok, searing, grilling) or commercial use, ducted is strongly preferred because ductless cannot keep up with the effluent volume.
What is UL 710 vs UL 710B?
UL 710 is the safety standard for ducted (exhaust) commercial kitchen hoods — covering grease capture, heat management, and fire suppression integration. UL 710B is the safety standard for ductless (recirculating) hoods — covering filter-based cleaning of cooking effluent before returning air to the room. Both standards are administered by UL and tested by either UL directly or by Intertek under the ETL mark. A hood listed to one standard is not interchangeable with the other; the airflow path determines which listing applies.
How often do you need to replace the charcoal filter in a ductless range hood?
For typical residential use (cooking 3-5 times per week), the charcoal filter in a ductless range hood should be replaced every 6 to 12 months. For heavy use (daily cooking with high heat), replacement every 3-6 months is recommended. JILU ships ductless hoods with the first charcoal filter pre-installed and ships replacement cartridges separately; OEM buyers can bundle a 2-year filter pack into the shipment to reduce customer service contacts.
Do ductless range hoods lose CFM over time?
Yes. As the charcoal filter loads with odor molecules, the static pressure across the filter increases and effective CFM drops. A new charcoal filter typically reduces effective CFM by 10-15% compared to the no-filter rated CFM. After 6 months of regular use, the loaded filter can reduce effective CFM by 25-35%. Replacing the filter restores the rated CFM. This is the single biggest operational difference between ducted and ductless hoods: ducted hoods lose 5-10% CFM to duct length and bends; ductless hoods lose 25-35% CFM to filter loading over the same period.
Can a ducted range hood be converted to ductless?
In most cases, yes. The conversion adds a charcoal filter to the exhaust path and redirects the blower outlet to recirculate back into the room instead of venting outside. The blower and hood body are unchanged. JILU ships convertible hoods with both ducted and ductless configurations in the same chassis — the OEM buyer or installer adds the charcoal filter cartridge at installation time and changes the duct adapter plate. This is the most common JILU configuration for OEM buyers shipping to apartment buildings where exterior wall penetration is not possible.
Which is more energy efficient, ducted or ductless?
Ductless hoods are more energy efficient in conditioned space because they do not exhaust heated or cooled air outside the building envelope. In a cold-climate kitchen, a ducted hood in winter pulls 200-400 CFM of warm indoor air outside every minute it runs, which the HVAC system must replace. A ductless hood returns that same air to the room after filtering, saving the heating or cooling energy. The trade-off is cleaning effectiveness — ductless is less effective at removing moisture and combustion gases.
Can I install a ductless range hood on an interior kitchen with no exterior wall?
Yes — this is the primary use case for ductless hoods. Because ductless hoods do not require a duct run to the building exterior, they can be installed on any interior wall or under any cabinet without any wall or roof penetration. The only requirements are a power supply (110V/120V or 220V/240V depending on the model) and enough clearance above the cooking surface (typically 24-30 inches for electric and 30-36 inches for gas). JILU ships ductless hoods as the standard configuration for apartment buildings, condos, and rental properties where exterior wall work is restricted.
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