Safety Cabinet & Separative Device Testing
Filter-integrity and airflow-visualisation measurement supporting acceptance and periodic verification of spatially confined clean-air and separative environments — where the device type and governing standard call for it.
Standards applicability by device type
“Safety cabinet” and “separative device” cover a wide continuum, from an open clean-air hood through to a wholly contained isolator. They are not governed by one common standard, and a test appropriate to one type is not automatically appropriate to another.
- Microbiological safety cabinetsAddressed by the EN 12469 series — classes and basic requirements in Part 1, class II cabinets in Part 2. Product, operator and environmental protection are separate performance questions.
- Cytostatic safety cabinetsAddressed by DIN 12980 where that cabinet type is in scope.
- IsolatorsWholly or largely contained enclosures; within the scope of ISO 14644-7 as a separative device, alongside device-specific and pharmaceutical requirements.
- GloveboxesContained enclosures accessed through glove ports; within the ISO 14644-7 scope.
- Clean-air hoodsOpen unidirectional-flow enclosures; within the ISO 14644-7 scope.
- Mini-environmentsLocalised controlled environments around a process or tool; within the ISO 14644-7 scope and common in semiconductor manufacturing.
It is not correct to state that all safety cabinets are tested according to ISO 14644-7. Cabinet-specific standards depend on cabinet type and application, and ISO 14644-7 addresses separative devices within its own defined scope — clean-air hoods, gloveboxes, isolators and mini-environments — in those respects where they differ from cleanrooms.
Governing references
EN 12469-5Installation, commissioning and routine testing of biological safety cabinets EN 12469-1Classes and basic requirements for biological safety cabinets DIN 12980Cytostatic safety cabinets, where that device type is in scope ISO 14644-7Separative devices genuinely within its scope — hoods, gloveboxes, isolators, mini-environmentsThe governing reference follows the device type. It is not correct to state that all safety cabinets are tested according to ISO 14644-7.
Verification activities and measurement scope
Primionics supplies the measurement technology for two of the verification activities that recur across device types: the integrity of the built-in filter system, and the behaviour of the airflow that produces the protective effect. Other performance criteria in the applicable cabinet standard — containment, operator protection, noise, illumination and the rest — sit outside this measurement scope.
Installed filter-system integrity
The built-in HEPA filters of a cabinet are installed into a frame and a housing, and the assembled system can leak where the element alone would not. The test challenges the upstream side with a test aerosol, measures the upstream reference concentration, and scans the downstream side for local penetration.
Airflow behaviour and containment
Visible fog makes the inflow at the work opening, the internal downflow, the recirculation path and the behaviour at the aperture observable. It is a qualitative method: it shows how the air moves, and does not substitute for quantitative velocity measurement where the standard specifies one.
Cabinet qualification measurement architecture
Topas uses the leak test on the built-in filter system of a safety cabinet as the worked example describing how its cleanroom test equipment set functions.
Filter-integrity workflow
The sequence mirrors the installed-filter integrity test used in a cleanroom, scaled to the confined geometry of a cabinet and to the positions the applicable standard requires.
- Generate the test aerosolATM 228 or ATM 226 introduced into the cabinet airflow
- Reach the upstream sideAerosol carried to the plenum upstream of the built-in filters
- Dilute the sampled raw gasDIL 544 reduces the sampled concentration into the counter range
- Measure the upstream referenceCPA 341 determines the raw-gas concentration
- Scan downstreamSYS 529 rectangular probe traverses the filter face and seals
- Record and evaluateLeakage located, documented and assessed against the applicable criterion
Airflow-visualisation workflow
Fog introduced at and around the work opening makes the aperture behaviour visible: whether inflow is maintained across the full opening, whether downflow reaches the work surface without disruption, how the flow behaves around equipment and the operator's arms, and whether there are regions where air is not being displaced.
- Stage 1Establish the operating conditionRun the cabinet in its defined operating state with the sash at the working position.
- Stage 2Introduce visible fogPosition the CFG 291 at the aperture, work surface and other defined observation zones.
- Stage 3Observe and recordCapture inflow, downflow, turbulence, transitions and any regions of poor displacement.
- Stage 4Evaluate the observed behaviourCompare the recorded flow pattern with the applicable method and cabinet design intent.
Standards applicability and application context
No single standard governs every cabinet. The applicable reference follows the device type, the application and the project or regulatory requirement.
| Reference | Edition / status | Application context |
|---|---|---|
| EN 12469-5 | 2025 — Current published reference | Installation, commissioning and routine testing — the part that governs field verification |
| EN 12469-1 | 2025 — Current published reference | Classes, terminology and basic requirements for biological safety cabinets |
| EN 12469-2 | 2025 — Current published reference | Class II biological safety cabinets |
| DIN 12980 | 2017-05 — Current published reference | Cytostatic and other CMR cabinets and isolators only — not all safety cabinets |
| ISO 14644-3 | 2019 (Edition 2) — Current published reference | Cleanroom-style test methods where technically relevant |
| ISO 14644-7 | 2004 (Edition 1) — Current published reference | Separative devices within its actual scope, such as clean-air hoods, gloveboxes, isolators and mini-environments |
| VDI 3491 | Current published reference | Test-aerosol generation, preparation and dilution context for the challenge used in the leak test |
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Primionics supplies measurement technology for installed-filter integrity, airflow visualisation and selected airflow measurement on these devices. Microbiological containment, personnel and product protection, noise, lighting and electrical safety testing under the EN 12469 series are separate activities and are not covered by this measurement scope.
Measurement technologies for cabinet verification
A given verification uses a subset of these, chosen by the tests that actually apply to the device and the standard. They are not all required in every configuration.
CFG 291Making inflow, downflow and aperture behaviour observable.- TopFog fluid
- Approx. 25 min run
- Spot probe
- Battery
CPA 341Raw-gas reference, exhaust and clean-air measurement positions.- 0.3 – 10 µm
- 28.3 L/min
- 5 size classes
ATM 226Portable test aerosol entered into the cabinet airflow.- 70 – 300 L/h
- Integrated compressor
- 4.8 kg
ATM 228Mobile pressure-controlled test-aerosol generation.- 20 – 250 L/h
- Integrated compressor
- 3.9 kg
SYS 529Scanning the built-in filter system at 28.3 L/min counter flow.- 28.3 L/min
- 31 – 47 cm/s
- Rectangular
DIL 544Reducing the sampled raw-gas concentration for reference measurement.- 1:100
- 28.3 L/min
- Automatic setting
Cabinet verification system configuration
Share the cabinet or separative-device type, the built-in filter arrangement, the tests required by the governing standard and the reporting the facility needs.