Filtered, recirculating fume hoods that need no ductwork at all
Ductless (Filtered) Fume Hoods
A ductless fume hood — filtered fume hood, recirculating fume hood — does outdoors what used to require a rooftop: room air sweeps the chamber, dual activated carbon filters adsorb the chemical load, a HEPA stage polishes particulates, and the purified air returns to the room. No ductwork, no roof penetration, no exhaust fan — a self-contained fume hood that plugs in and runs where the work is. The engineering problem in a ductless hood is knowing when the filter is done. WSHLAB's filtered cabinets solve it with dual VOC probes — one monitoring the chamber exhaust, one monitoring room air — feeding a saturation alarm with user-set thresholds. The 7-inch touchscreen shows temperature, humidity and VOC concentration live; when the carbon's capacity approaches its end, the alarm says so before the chemistry does. Modular filters configure the cabinet for liquids, dusts or mixed loads. Ductless hoods fit the chemistry that is low-volume and well-characterised: weighing, sample prep, light titrations, aliquoting. For high-volume or exotic chemistry, choose ducted. Send us the chemical list and the hourly usage, and we will specify which regime — and which filter set — your application needs.
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Intelligent Ductless Filtered Safety Cabinet
- Model
- Intelligent ductless filtered safety cabinet (DNJQ series)
- Widths
- 800 / 1000 / 1275 / 1600mm (benchtop and floor-standing models)
- Body
- ≥1.2mm steel, epoxy powder coated, chemical-resistant finish
- Front and side panels
- ≥6mm acrylic, transparent
Price on request
TECHNICAL DATA
Engineering the filtered cabinet
The cabinet body is ≥1.2mm steel with epoxy powder coating; front and side panels are ≥6mm acrylic for full visibility. A PSC fan runs 24-hour duty at 39-40 dBA — quieter than a conversation. The 7-inch touchscreen shows temperature, humidity, fan state and dual VOC concentrations, with integrated alarm and data logging. Face velocity holds 0.4-0.6 m/s at the working opening, and the whole platform is JG/T 385-2012 compliant.
Ductless (Filtered) Fume Hoods
View ProductIntelligent Ductless Filtered Safety Cabinet
- Model
- Intelligent ductless filtered safety cabinet (DNJQ series)
- Widths
- 800 / 1000 / 1275 / 1600mm (benchtop and floor-standing models)
- Body
- ≥1.2mm steel, epoxy powder coated, chemical-resistant finish
- Front and side panels
- ≥6mm acrylic, transparent
- Display
- 7-inch LCD touchscreen
- Monitoring
- Temperature, humidity, dual VOC concentration, fan state, filter status
- Alarms
- Filter saturation (user-set) · fan failure · setpoint deviation
- Filtration
- Dual-layer activated carbon + HEPA; modular liquid / dust / mixed configurations
- Air handling
- 235-690 m³/h by model; face velocity 0.4-0.6 m/s
- Fan
- PSC, 24-hour duty, 39-40 dBA, 82-218W
- Power
- 220-240V, 50-60Hz
- Compliance
- ASHRAE 110, UL 1805
- Width
- 1200mm
- Material
- Steel + Dual Carbon
- Form Factor
- Floor-Standing
Applications
Where ductless hoods work
Low-volume chemical capture wherever ductwork cannot reach.
Sample preparation with solvents and reagents
Light titration and wet chemistry in teaching labs
Histology and pathology staining benches
Pharmacy compounding support and storage-adjacent handling
Quality benches in leased or temporary facilities
PERFORMANCE & SELECTION
What is a ductless fume hood?
A ductless fume hood is a self-contained fume hood: a chamber with the same sash-and-face-velocity discipline as a ducted hood, but with the exhaust passed through activated carbon and HEPA filtration and returned to the room. The air recirculates — hence recirculating fume hood — which removes the entire exhaust infrastructure from the project. Containment discipline stays identical: capture at the face, filter the load, monitor the result.
- Same capture discipline as a ducted hood
- Carbon adsorption + HEPA particulate filtration
- Recirculating: no duct, no fan, no roof penetration
- Self-contained — 220V socket and it runs
CONFIGURATION & COMPATIBILITY
Carbon and HEPA filtration
The dual-layer carbon bed does the chemical work: activated carbon and impregnated media adsorb more than 500 common laboratory chemicals — solvents, acids, amines, aldehydes — selected against a published chemical compatibility chart. The HEPA stage handles particulates and powders. Filters are modular: liquid-phase, dust and mixed configurations mount in the same bay, so the cabinet reconfigures with the workflow, not against it.
- Dual-layer activated carbon adsorbs 500+ chemicals
- Impregnated media for acid gas, ammonia, formaldehyde classes
- HEPA stage for powders and particulates
- Modular filter bays: liquid, dust or mixed loads
IDENTIFICATION & TRACEABILITY
Clear Product Identification & Specification
Product names, model numbers, SKUs and option identifiers keep quotations, orders and internal records aligned.
- Product and model identification
- Option-specific SKU information
- Consistent quotation specifications
PRODUCT IDENTIFICATIONDuctless (Filtered) Fume Hoods
- Catalog
- Laboratory equipment
- Products
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- Selection
- Specification-led
Traceability
Traceability and documentation
Filters are dated, logged and archived against each unit.
- Serialised cabinet, fan and probe records
- Filter batch and installation dates logged on the controller
- Chemical compatibility chart maintained against filter media
- Alarm and run history exportable for study records
- Factory test data archived per serial number
Quality system
Quality system and factory testing
Every cabinet is airflow, alarm and filter-verified before dispatch.
ISO 9001 production line; JG/T 385-2012 compliant platform
Face velocity verified at the working opening
VOC probe and saturation alarm function-tested
Filter bed leak check before shipping
Serialised factory test report with each cabinet
Why WSHLab
Why laboratories choose ductless
The exhaust system in a box, monitored end to end.
No ductwork, no roof penetration, no exhaust fan to maintain
Dual carbon + HEPA filtration with 500+ chemical adsorption
Dual VOC probes with saturation alarm and run history
7-inch touchscreen with live environment monitoring
Relocates and reconfigures with the workflow
OPTIONS & SPECIFICATIONS
Ductless (Filtered) Fume Hoods Options & Specifications
Choose the format that suits your application, workload and handling requirements.
Ductless fume hoods with carbon and HEPA filtration
Recirculating, self-contained operation — plug and run
Dual VOC probes with filter saturation alarm
Molecular filtration adsorbs 500+ common chemicals
Benchtop and floor-standing filtered cabinets
| Type | Capacity / Option | Material / Specification | Suitable Application | Storage / Handling |
|---|---|---|---|---|
| Ductless fume hoods with carbon and HEPA filtration | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Recirculating, self-contained operation — plug and run | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Dual VOC probes with filter saturation alarm | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Molecular filtration adsorbs 500+ common chemicals | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Benchtop and floor-standing filtered cabinets | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
Delivery and site
Delivery and installation
Placement and a socket — that is the installation.
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Ships assembled on a pallet; two-person placement
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220V/50Hz standard supply (110V/60Hz optional)
- 03
Level floor or reinforced bench per model
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Filter media configured to your chemical list before dispatch
- 05
Operator training on alarm and filter change available; 12-month warranty
RECOMMENDATIONS
Related Products
Products frequently compared within this catalog.
Gallery
Ductless filtered fume hoods
Benchtop and floor-standing filtered cabinets from the WSHLAB ductless series.
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QUESTIONS & ANSWERS
Ductless (Filtered) Fume Hoods: frequently asked questions
The questions buyers ask most often when specifying Ductless (Filtered) Fume Hoods, answered by our technical team.
No ductwork needed?
Correct — the hood filters its exhaust through carbon and HEPA media and returns purified air to the room. Installation is placement and a power socket.
What filters does it use?
Dual-layer activated carbon (with impregnated media for acid gas, ammonia and formaldehyde classes) plus a HEPA stage. Modular bays configure for liquids, dusts or mixed loads; replacement is a stocked, dated spare.
What chemicals can it handle?
Low-volume, well-characterised chemistry: the carbon beds adsorb 500+ common chemicals. High-volume, highly toxic or non-adsorbable work should stay ducted — we confirm scope from your chemical list.
How do I know when to replace filters?
Dual VOC probes and the saturation alarm tell you before breakthrough; the pressure gauge and filter life indicator show the bed state at a glance, and the controller logs what the filter has seen.
Get a quotation
Request your ductless fume hood quotation
Send the chemical list and the daily usage, and we will confirm the filter configuration, the probe thresholds and the cabinet — quoted within one working day.